title: Studies on the constituents of bark of Parameria laevigata Moldenke.
abstract: One new trimeric proanthocyanidin, epicatechin-(2beta-->O-->7, 4beta-->6)-epicatechin-(2beta-->O--->7, 4beta-->8)-epicatechin (5) and two new tetrameric proanthocyanidins, epicatechin-(2beta-->O-->7, 4beta-->8)-[epicatechin-(4beta-->6)]-epicatechin-(4beta-->8)-epicatechin, named as parameritannin A-1 (6), and epicatechin-(2beta-->O-->5, 4beta-->6)-[epicatechin-(2beta-->O-->7, 4beta-->8)]-epicatechin-(4beta-->8)-epicatechin, named as parameritannin A-2 (7), have been isolated from the bark of Parameria laevigata Moldenke (Apocynaceae) along with the two known dimers, proanthocyanidin A-2 (1) and proanthocyanidin A-6 (2), and two trimers, cinnamtannin B-1 (3) and aesculitannin B (4). These structures were elucidated by spectral and chemical evidence.
authors.affiliation: Faculty of Pharmaceutical Sciences, Kobe Gakuin University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kamiya
authors.forename: C
authors.initials: C
authors.lastname: Watanabe
authors.forename: H
authors.initials: H
authors.lastname: Endang
authors.forename: M
authors.initials: M
authors.lastname: Umar
authors.forename: T
authors.initials: T
authors.lastname: Satake
mesh_terms: D000872:Anthocyanins / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D019441:Plant Epidermis / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D044945:Proanthocyanidins; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000872:Anthocyanins; D044945:Proanthocyanidins; C013221:proanthocyanidin