Constituents of Ephemerantha fimbriata. Isolation and Structure Elucidation of Two New Phenanthrenes, Fimbriol-A and Fimbriol-B, and a New Dihydrophenanthrene, Ephemeranthol-C

Abstract

Constituents of Ephemerantha fimbriata (BL.) P. F. HUNT et SUMMERH, which is used as a source plant of the Chinese crude drug "Shi-Hu", were examined and two new phenanthrenes, fimbriol-A (2) and fimbriol-B (8), a new dihydrophenanthrene, ephemeranthol-C (6), and dihydroconiferyl dihydro-p-coumarate (5) were isolated together with denbinobin (1), (+)-pinoresinol (3), (+)-syringaresinol (4), 3, 4, 5-trimethoxybenzoic acid (7), lusianthridin (9), and dihydro-p-coumaric acid (10). Structures of the new compounds were elucidated by the use of spectroscopic methods including two-dimensional NMR techniques.