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Iridoid glycosides from Penstemon richardsonii
Affiliation:1. Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;2. Catholic Laboratory Development and Evaluation Center, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;3. Division of Infectious Diseases, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;4. Vaccine Bio Research Institute, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;5. Catholic Blood and Marrow Transplantation Center, Seoul St. Mary''s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
Abstract:Five ester iridoids of the valeriana type have been isolated from dried leaves of Penstemon richardsonii. The structures have been elucidated by FAB MS 1H NMR and 13C NMR spectroscopy and by enzymatic cleavage of the glycosidic linkages. Besides the known iridoids penstemide penstemide-aglucone 8-epi-valerosidatum and serrulatoside a new iridoid penstebioside (penst of an iridoid aglycone attached to cellobiose.
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