Carbon-13 nuclear magnetic resonance spectrometry of acerinol (I) and its related compounds (IV, V) proposes a revised structure (Ia) for acerinol, which was obtained first from Cimicifuga acerina (SIEB. et ZUCC.) C.TANAKA, and from C. simplex WORMSK. and C. japonica SPRENGEL in the present work. 25-O-Methylacerinol (II), mp 146-148°, C31H48O5, was obtained from C. acerina, while acerionol (III), mp 248-249.5°, C30H46O5, and 24-O-acetylacerionol (IV), mp 201-202°, C32H48O6, were obtained from the above three species of Japanese Cimicifuga plants. Structures are proposed on the basis of their chemical and spectroscopic data.
