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Patricia O'Sullivan, EdD

Title(s)Professor, Medicine
SchoolSchool of Medicine
ORCID ORCID Icon0000-0002-8706-4095 Additional info
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    Rosemont College, PennsylvaniaAB5/70Chemistry
    University of Pennsylvania, PennsylvaniaMS12/71Chemistry
    University of Houston, TexasEdD12/78Education
    University of California, San Francisco, CA2017Diversity, Equity, and Inclusion Champion Training

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    Patricia S. O’Sullivan is a Professor of Medicine and Surgery and Director, Research and Development in Medical Education, at the University of California, San Francisco School of Medicine. She holds the Endowed Chair in Surgical Education. At UCSF she directs the Teaching Scholars Program and oversees the doctoral program in health professions education as well as leads efforts in faculty development and educational research. Her educational research studies have collaborators from medicine, nursing, pharmacy, and health related professions. The UCSF faculty development program received the international ASPIRE for Excellence Award. Dr. O’Sullivan has led the Research in Medical Education Section of the AAMC, the RIME Program Planning Committee and the Division for Professions Education of the American Educational Research Association. She is a Fellow of the American Educational Research Association and recipient of the Merrill Flair Award from the GEA, of the Outstanding Career Achievements in Medical Education from the Society of General Internal Medicine and the UCSF Lifetime Achievement in Mentoring Award.

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    Publications listed below are automatically derived from MEDLINE/PubMed and other sources, which might result in incorrect or missing publications. Researchers can login to make corrections and additions, or contact us for help.
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    1. Steinauer JE, Teherani A, Preskill F, Ten Cate O, O'Sullivan P. What Do Medical Students Do and Want When Caring for "Difficult Patients"? Teach Learn Med. 2019 Jun-Jul; 31(3):238-249. PMID: 30556426.
      View in: PubMed
    2. Green CA, Abrahamson D, Chern H, O'Sullivan PS. Is Robotic Surgery Highlighting Critical Gaps in Resident Training? J Grad Med Educ. 2018 Oct; 10(5):491-493. PMID: 30377478.
      View in: PubMed
    3. Green CA, O'Sullivan PS, Sarin A, Chern H. Microanalysis of video from a robotic surgical procedure: implications for observational learning in the robotic environment. J Robot Surg. 2019 Jun; 13(3):449-454. PMID: 30173348.
      View in: PubMed
    4. Steinauer JE, O'Sullivan P, Preskill F, Ten Cate O, Teherani A. What Makes "Difficult Patients" Difficult for Medical Students? Acad Med. 2018 09; 93(9):1359-1366. PMID: 29727319.
      View in: PubMed
    5. Young JQ, Hasser C, Hung EK, Kusz M, O'Sullivan PS, Stewart C, Weiss A, Williams N. Developing End-of-Training Entrustable Professional Activities for Psychiatry: Results and Methodological Lessons. Acad Med. 2018 07; 93(7):1048-1054. PMID: 29166349.
      View in: PubMed
    6. Young JQ, Rasul R, O'Sullivan PS. Evidence for the Validity of the Psychopharmacotherapy-Structured Clinical Observation Tool: Results of a Factor and Time Series Analysis. Acad Psychiatry. 2018 Dec; 42(6):759-764. PMID: 29951950.
      View in: PubMed
    7. Hauer KE, O'Sullivan PS, Fitzhenry K, Boscardin C. Translating Theory Into Practice: Implementing a Program of Assessment. Acad Med. 2018 03; 93(3):444-450. PMID: 29116979.
      View in: PubMed
    8. Green CA, Kim EH, O'Sullivan PS, Chern H. Using Technological Advances to Improve Surgery Curriculum: Experience With a Mobile Application. J Surg Educ. 2018 Jul - Aug; 75(4):1087-1095. PMID: 29397357.
      View in: PubMed
    9. Young JQ, Irby DM, Kusz M, O'Sullivan PS. Performance Assessment of Pharmacotherapy: Results from a Content Validity Survey of the Psychopharmacotherapy-Structured Clinical Observation (P-SCO) Tool. Acad Psychiatry. 2018 Dec; 42(6):765-772. PMID: 29380145.
      View in: PubMed
    10. Green CA, Chern H, O'Sullivan PS. Current robotic curricula for surgery residents: A need for additional cognitive and psychomotor focus. Am J Surg. 2018 Feb; 215(2):277-281. PMID: 29137721.
      View in: PubMed
    11. Green CA, Huang E, Zhao NW, O'Sullivan PS, Kim E, Chern H. Technical skill improvement with surgical preparatory courses: What advantages are reflected in residency? Am J Surg. 2018 07; 216(1):155-159. PMID: 29117916.
      View in: PubMed
    12. Sewell JL, Boscardin CK, Young JQ, Ten Cate O, O'Sullivan PS. Learner, Patient, and Supervisor Features Are Associated With Different Types of Cognitive Load During Procedural Skills Training: Implications for Teaching and Instructional Design. Acad Med. 2017 11; 92(11):1622-1631. PMID: 28445213.
      View in: PubMed
    13. Lebares CC, Guvva EV, Ascher NL, O'Sullivan PS, Harris HW, Epel ES. Burnout and Stress Among US Surgery Residents: Psychological Distress and Resilience. J Am Coll Surg. 2018 01; 226(1):80-90. PMID: 29107117.
      View in: PubMed
    14. Irby DM, O'Sullivan PS. Developing and rewarding teachers as educators and scholars: remarkable progress and daunting challenges. Med Educ. 2018 Jan; 52(1):58-67. PMID: 28771776.
      View in: PubMed
    15. O'Sullivan PS, Yuan P, Satre DD, Wamsley M, Satterfield J. A Sequential Implementation Model for Workforce Development: A Case Study of Medical Residency Training for Substance Use Concerns. Teach Learn Med. 2018 Jan-Mar; 30(1):84-94. PMID: 28498004.
      View in: PubMed
    16. O'Brien BC, Bachhuber MR, Teherani A, Iker TM, Batt J, O'Sullivan PS. Systems-Oriented Workplace Learning Experiences for Early Learners: Three Models. Acad Med. 2017 05; 92(5):684-693. PMID: 27254010.
      View in: PubMed
    17. Ten Cate O, Derese A, Durning SJ, O'Sullivan P. Excellence in PhD dissertations in health professions education: Toward standards and expectations. Med Teach. 2017 Sep; 39(9):926-930. PMID: 28375662.
      View in: PubMed
    18. O'Brien BC, O'Sullivan PS. Mixed Methods in Health Professions Education Scholarship. J Grad Med Educ. 2017 Apr; 9(2):253-254. PMID: 28439364.
      View in: PubMed
    19. Gonzalo JD, Dekhtyar M, Starr SR, Borkan J, Brunett P, Fancher T, Green J, Grethlein SJ, Lai C, Lawson L, Monrad S, O'Sullivan P, Schwartz MD, Skochelak S. Health Systems Science Curricula in Undergraduate Medical Education: Identifying and Defining a Potential Curricular Framework. Acad Med. 2017 01; 92(1):123-131. PMID: 27049541.
      View in: PubMed
    20. Young JQ, Boscardin CK, van Dijk SM, Abdullah R, Irby DM, Sewell JL, Ten Cate O, O'Sullivan PS. Performance of a cognitive load inventory during simulated handoffs: Evidence for validity. SAGE Open Med. 2016; 4:2050312116682254. PMID: 28348737.
      View in: PubMed
    21. Stone A, Wamsley M, O'Sullivan P, Satterfield J, Satre DD, Julian K. Faculty development efforts to promote screening, brief intervention, and referral to treatment (SBIRT) in an internal medicine faculty-resident practice. Subst Abus. 2017 Jan-Mar; 38(1):31-34. PMID: 27897470.
      View in: PubMed
    22. Chen HC, Wamsley MA, Azzam A, Julian K, Irby DM, O'Sullivan PS. The Health Professions Education Pathway: Preparing Students, Residents, and Fellows to Become Future Educators. Teach Learn Med. 2017 Apr-Jun; 29(2):216-227. PMID: 27813688.
      View in: PubMed
    23. Kaplan JA, Brinson Z, Hofer R, O'Sullivan P, Chang A, Horvath H, Chang GJ, Finlayson E. Early learners as health coaches for older adults preparing for surgery. J Surg Res. 2017 03; 209:184-190. PMID: 28032558.
      View in: PubMed
    24. Young JQ, van Dijk SM, O'Sullivan PS, Custers EJ, Irby DM, Ten Cate O. Influence of learner knowledge and case complexity on handover accuracy and cognitive load: results from a simulation study. Med Educ. 2016 Sep; 50(9):969-78. PMID: 27562896.
      View in: PubMed
    25. O'Sullivan PS. What's in a learning environment? Recognizing teachers' roles in shaping a learning environment to support competency. Perspect Med Educ. 2015 Dec; 4(6):277-9. PMID: 26525366.
      View in: PubMed
    26. Chen HC, O'Sullivan P, Teherani A, Fogh S, Kobashi B, ten Cate O. Sequencing learning experiences to engage different level learners in the workplace: An interview study with excellent clinical teachers. Med Teach. 2015; 37(12):1090-7. PMID: 25693794.
      View in: PubMed
    27. Boscardin CK, Grbic D, Grumbach K, O'Sullivan P. Educational and individual factors associated with positive change in and reaffirmation of medical students' intention to practice in underserved areas. Acad Med. 2014 Nov; 89(11):1490-6. PMID: 25250749.
      View in: PubMed
    28. Chern H, Sheu L, O'Sullivan P, Kim E.Home Video Curriculum for Basic Surgical Skills. MedEdPORTAL. 2014.
    29. Chern H, Kim E, O'Sullivan P.. PIGS (Porcine Integrated General Surgery Simulation) Curriculum. MedEdPORTAL. 2014.
    30. Buckelew S, Whittle A, Lum P, O'Sullivan P, Satterfield J.Implementing SBIRT in pediatrics: Results of a needs assessment. Journal of Adolescent Health. 2013; 52(2):S18-19.
    31. Gusic M, Amiel J, Baldwin C, Chandran L, Fincher R, Mavis B, et al.Using the AAMC Toolbox for Evaluating Educators: You be the Judge. MedEdPORTAL. 2013.
    32. Uijtdehaage S, Kalishman S, O'Sullivan P, Robins L.How to Succeed as a Medical Education Scholar: Identifying Your Individual Strategy and Creating a Roadmap For Scholarship. MedEdPORTAL. 2013.
    33. Wamsley MA, Julian KA, O'Sullivan P, Sartre DD, McCance-Katz E, Batki SL, Satterfield JM.Designing standardized patients assessment to measure SBIRT skill for residents: A literature review and case study. Journal of Alcohol and Drug Education. 2013; 34:344-349.
    34. Aronson L, Kruidering M, O'Sullivan P.. The UCSF Faculty Development Workshop on Critical Reflection in Medical Education: Training Educators to Teach and Provide Feedback on Learners' Reflections. MedEdPORTAL. 2012.
    35. O'Sullivan PS.. Reflections on the identity development of medical educators. Medical Science Educator. 2012; 22:129-132.
    36. Aronson L, Kruidering M, Niehaus B, O'Sullivan P.. UCSF LEAP (Learning from your Experiences as a Professional): Guidelines for Critical Reflection. MedEdPORTAL. 2012.
    37. O'Sullivan PS, Irby DM. Reframing research on faculty development. Acad Med. 2011 Apr; 86(4):421-8. PMID: 21346505.
      View in: PubMed
    38. Young JQ, Lieu S, O'Sullivan P, Tong L .Enhancing Pharmacotherapy Competence with Performance Assessment: Development and Initial Testing of a Structured, Clinical Observation Tool. Academic Psychiatry. 2011; 35:27-34.
    39. Wamsley M, Treit K, Satterfield J, Levitt D, McCance-Katz E, Moreno-John G, et al.Three Standardized Patient Cases to Measure Screening, Brief Intervention and Referral to Treatment (SBIRT) Skills in Primary Care Residents. MedEdPORTAL. 2011.
    40. O'Sullivan PS, Stoddard HA, Kalishman S. Collaborative research in medical education: a discussion of theory and practice. Med Educ. 2010 Dec; 44(12):1175-84. PMID: 21070341.
      View in: PubMed
    41. O'Sullivan P, Aronson L, Chittenden E, Niehaus B, Learman L.Reflective Ability Rubric and User Guide. MedEdPORTAL. 2010.
    42. Young JQ, Niehaus B, Lieu SC, O'Sullivan PS.. Adapting Mental Workload Theory to Construct Balanced Caseloads in Outpatient Continuity Clinics: A Method to Improve Resident Education and Patient Safety. Academic Medicine. 2010; 85:1418-1424.
    43. O'Sullivan PS, Niehaus B, Lockspeiser TM, Irby DM. Becoming an academic doctor: perceptions of scholarly careers. Med Educ. 2009 Apr; 43(4):335-41. PMID: 19335575.
      View in: PubMed
    44. Wamsley M , Ng R, Chang A, Hauer K, OSullivan P, Alpers L, et al.Joe Thornton: Teaching and Assessing Medical Students Chronic Disease Management Skills Utilizing the Chronic Care Model and a Standardized Patient. MedEdPORTAL. 2009.
    45. Kane JM, Burns RE, O'Sullivan PS, Hart TJ, Thomas JR, Harrison IA .Design, Implementation, and Evaluation of the Transition from Paper and Pencil to Computer Assessment in the Medical Microscopic Anatomy Curriculum. Journal of the International Association of Medical Educators. 2007; 15:85-91.
    46. O'Sullivan PS, Heard JK, Petty M, Mercado CC, Hicks E. Educational development program for residency program directors and coordinators. Teach Learn Med. 2006; 18(2):142-9. PMID: 16626273.
      View in: PubMed
    47. Viegas SM, Richards KC, Beck CK, Lambert CW, O'Sullivan PS, Cole CS, Hutchison L, Shue VM.Predictors of daytime sleep in nursing home residents with dementia. Journal of the American Psychiatric Nurses Association. 2006; 12(5):286-293.
    48. Simpson KC, Richards KC, Enderlin CA, O'Sullivan PS, Koehn M.Medications and sleep in nursing home residents with dementia. Journal of the American Psychiatric Nurses Association. 2006; 12:279-285.
    49. Jarvis RM, Guise JB, Clardy JA, Thrush CR, Moses A, O'Sullivan P.. GME Showcase Portfolio Assessment. MedEdPORTAL. 2006.
    50. Petty ME, Allen RM, O'Sullivan PS, Heard JK.Facilitating curricular change: An institutional approach to aiding residency program directors' efforts with ACGME competencies. Annals of Behavioral Science and Medical Education. 2005; 11:114-118.
    51. O'Sullivan PS, Petty MP, Heard JK.Development Program for Residency Program Directors and Coordinators. MedEdPORTAL. 2005.
    52. Thrush CR, O'Sullivan PS, Clardy JA, Vander Putten J, Kamin C.Portfolio assessment and self-directed learning. Academic Exchange Quarterly. 2005; 9(3):240-244.
    53. McSweeney J, O'Sullivan P, Moser D, Clark L, Green A, Knight D.Recognizing prodromal symptoms in women at risk for coronary heart disease. The Female Patient. 2004; 29(8):10-14.
    54. Zraick RI, Dennie TM, Tabbal SD, Hutton TJ, Hicks GM, O'Sullivan PS.. Reliability of speech intelligibility ratings using the unified Parkinson's Disease rating scale. Journal of Medical Speech-Language Pathology. 2003; 11:227-240.
    55. Richards KC, O'Sullivan PS, Phillips RL.The Richards-Campbell Sleep Questionnaire: Measurement of sleep in critically ill patients. Journal of Nursing Measurement. 2000; 8(2):131-145.
    56. Souder E, Heithoff K, O'Sullivan P, Lancaster AE, Beck C.Contexts and impacts of disruptive behavior in institutionalized elders. Aging & Mental Health. 1999; 3(1):54-68.
    57. Souder E, O'Sullivan P, Pechenik G.A comparison of scoring criteria for Clock Drawing Test. Journal of Clinical Geropsychology. 1999; 5(2):139-145.
    58. Beck C, Heithoff K, Baldwin B, Cuffel B, O'Sullivan P, Chumbler NR.Assessing disruptive behavior in older adults: The Disruptive Behavior Scale. Aging & Mental Health. 1997; 1(1):71-79.
    59. Means KM, Rodell DE, O'Sullivan PS.. Performance-based prevention/rehabilitation of falls in elderly veterans. Rehabilitation R&D Progress Reports. 1997; 34106.
    60. Wiseman EJ, Souder E, O'Sullivan P.. Neuropsychological test performance of older and younger patients with alcohol dependence. Clinical Gerontologist. 1997; 17(3):66-68.
    61. Drummond SS, Danger J, Casey BE, O'Sullivan P.. Visual recognition training of older adults with speech spectrograms. Perceptual & Motor Skills. 1996; 82(2):379-382.
    62. Wiseman EJ, Souder E, O'Sullivan P.. Age and denial of alcoholism severity. Clinical Gerontologist. 1996; 17(1):55-58.
    63. Beck DE, Boh LE, O'Sullivan PS.. Evaluating student performance in the experiential setting with confidence. American Journal of Pharmaceutical Education. 1995; 59:236-247.
    64. Beck DE, O'Sullivan PS, Boh LE.Increasing the accuracy of observer ratings by enhancing cognitive processing skills. American Journal of Pharmaceutical Education. 1995; 59:228-235.
    65. Vessey JA, O'Sullivan P, Monsen RB .The hot fudge sundae road to tenure. Nurse Educator. 1995; 7:121-124.
    66. Beck DE, Aceves-Blumenthal C, Jirak J, Kawahara N, Morris N, O'Sullivan PS.. Recognizing volunteer practitioner-educators through intrinsic and extrinsic incentives. American Journal of Pharmaceutical Education. 1995; 59:105-113.
    67. O'Sullivan PS, Pinsker J, Jeremiah J, Wartman SA.A learner-centered journal club. Teaching and Learning in Medicine. 1995; 7:121-124.
    68. Epstein LC, Hayes J, Arnold L, O'Sullivan P, et al.On becoming a physician: perspectives of students in combined baccalaureate-M.D. degree programs. Teaching and Learning in Medicine. 1994; 6:102-107.
    69. Reuben SS, Dunn SM, Duprat KM, O'Sullivan P.. An intrathecal fentanyl dose- response study in lower extremity revascularization procedures. Anesthesiology. 1994; 81(6):1371-1375.
    70. Research from the research utilization project environmental temperatures. Journal of Obstetric, Gynecologic, and Neonatal Nursing. 1994; 23:341-344.
    71. Stein MD, O'Sullivan PS, Ellis RJ, et al.Utilization of medical services by drug abusers in detoxification. Journal of Substance Abuse. 1993; 5(2):187-193.
    72. O'Sullivan P, Mahoney G, Robinson C.Perceptions of pediatricians' helpfulness: A national study of mothers of young disabled children. Developmental Medicine & Child Neurology. 1992; 34(12):1064-1071.
    73. Mahoney G, O'Sullivan PS, Robinson C.The family environments of children with disabilities. Topics in Early Childhood and Special Education. 1992; 12:386-402.
    74. Dunn SM, Steinberg RB, O'Sullivan PS, Goolishian WT, Villa EA.A fractured epidural needle: case report and study. Anesthesia & Analgesia. 1992; 75(6):1050-1052.
    75. O'Sullivan PS, Pinsker J, Landau C.Evaluation strategies selected by residents: the role of self-assessment, training level and sex. Teaching and Learning in Medicine. 1991; 3(2):101-107.
    76. Camp-Sorrell D, O'Sullivan P.. Effects of continuing education: Pain assessment and documentation. Cancer Nursing. 1991; 14(1):49-54.
    77. O'Sullivan PS, Goodman PA.Involving practicing nurses in research. Applied Nursing Research. 1990; 3(4):169-173.
    78. The relationship of attitude, subjective norm, and behavioral intent to the documentation behavior of nurses. Scholarly Inquiry for Nursing Practice. 1990; 4(1):47-60.
    79. Mahoney G, O'Sullivan P, Dennebaum J.A national study of mother's perception of family focused intervention. Journal of Early Intervention. 1990; 14:133-146.
    80. Gargiulo RM, O'Sullivan P, Stephens D, Goldman R.Sibling relationships in mildly mentally retarded and nonretarded children. National Forum in Special Education. 1990; 1:20-32.
    81. Mahoney G, O'Sullivan P.. Early intervention practices with families of children with handicaps. Mental Retardation. 1990; 28(3):169-176.
    82. Mahoney G, O'Sullivan P, Dennebaum J.Maternal perceptions of early intervention services: A Scale for assessing family focused intervention. Topics of Early Childhood Special Education. 1990; 10:1-15.
    83. Special education practices with young handicapped children. Journal of Early Intervention. 1989; 13:261-268.
    84. Pearman P, Hunter G, Hendricks C, O'Sullivan P.. Comparison of hydrostatic weighing and bioelectric impedance measurements in determining body composition pre- and postdehydration. The Journal of Orthopaedic and Sports Physical Therapy. 1989; 10:451-455.
    85. Mahoney G, O'Sullivan P, Fors S.The family practices of service providers for young handicapped children. Infant Mental Health Journal. 1989; 10(2):135-142.
    86. Brock AM, O'Sullivan P.. Nursingconnections. A study to determine the relationship between the method of organizing nursing care delivery and job satisfaction of nursing personnel. 1988; 1(1):31-41.
    87. Gargiulo RM, O'Sullivan PS, Barr NJ .Learned helplessness in reflective and impulsive mentally retarded and nonretarded children. Bulletin of the Psychonomic Society. 1987; 25:269-272.
    88. Quinn CM, O'Sullivan PS, Patterson ET .Effects of route of fluid administration on severity of side effects with postmetrizamidemyelogram. Journal of Neuroscience Nursing. 1987; 19(5):261-265.
    89. Gargiulo RM, O'Sullivan PS, Barr NJ.Assessment of learned helplessness in retarded and nonretarded children: a methodological investigation. Journal of Human Behavior and Learning. 1987; 4(3):33-42.
    90. Corb DF, Pinkston D, Harden RS, O'Sullivan P, Fecteau L.Changes in students' perceptions of the professional role. Physical Therapy. 1987; 67(2):226-233.
    91. Schwertner RM, Pinkston D, O'Sullivan P, Denton B.Transition from student to physical therapist: changes in perceptions of professional role and relationship between perceptions and job satisfaction. Physical Therapy. 1987; 67(5):695-701.
    92. Clayton GA, Sapp GL, O'Sullivan PS, Hall L.Comparative validity of two WAIS-R short forms with vocational rehabilitation clients. Perceptual and motor skills. 1986; 63:1303-1308.
    93. Sherer CL, Clelland J, O'Sullivan P, Doleys DM, Canan B.The effects of two sites of high frequency vibration on cutaneous pain threshold. Pain. 1986; 25(1):133-138.
    94. Mildly mentally retarded and nonretarded children's learned helplessness. American Journal of Mental Deficiency. 1986; 91(2):203-206.
    95. Brock AM, O'Sullivan PS.. A study to determine what variables predict institutionalization of elderly people. Journal of Advanced Nursing. 1985; 10(6):533-537.
    96. From wife to widow: Role transition in the elderly. Journal of Psychosocial Nursing & Mental Health Services. 1985; 23(12):6-12.
    97. O'Sullivan P.. Detecting communication problems. Nursing Management. 1985; 23(12):6-12.
    98. Bradford JY, O'Sullivan PS. Development of a cardiopulmonary resuscitation form. J Emerg Nurs. 1984 Mar-Apr; 10(2):65-8. PMID: 6368934.
      View in: PubMed
    99. McCall P, Sparger G, O'Sullivan P .. Analyzing communication patterns between an ED manager and staff members. Journal of Emergency Nursing. 1984; 10(4):229-232.
    100. An easy method to detect communication problems. Quality Circle Digest. 1982; 2:78-82.
    101. McCall P, O'Sullivan PS.. Vital sign documentation and primary nurses in the emergency department. Journal of Emergency Nursing. 1982; 8(4):187-190.
    102. O'Sullivan PS, Piper MK, Carbonari JP.A model for the effect of an inservice program on junior high school student science achievement. Journal of Research in Science Teaching. 1981; 18:199-207.
    103. The National Teacher Examination: Can it Predict Classroom Performance. Phi Delta Kappan. 1980; 62:401.
    104. O'Sullivan PS, Pecsok RS.MCT: An alternative in high school chemistry. Journal of Chemical Education. 1977; 54(1):43-44.
    105. A semiempirical theory of diamagnetic susceptibilities with particular emphasis on oxygen containing molecules. Journal of the American Chemical Society. 1970; 92:25-32.
    106. O'Sullivan PS, Hameka HF, de la Vega J.On the structure of cyclopentadiene. Chemical Physics Letters. 1970; 5:123-125.
    107. O'Sullivan PS, Hameka HF, de la Vega J.Calculation of bond angles in five-membered conjugated ring systems. Chemical Physics Letters. 1970; 5:576-578.