J. Borquez et al., ISOLATION AND STRUCTURE OF CROTONIC ACID, A CLERODANE DITERPENOID FROM CROTON CHILENSIS, Boletin de la Sociedad Chilena de Quimica, 40(2), 1995, pp. 157-162
A diterpenic acid, the clerodane 1, crotonic acid was isolated from Cr
oton chilensis Muell. Arg, and identified as 18-acetoxy-cis-cleroda-3,
13 Z-dien-15-oic acid (8 beta H, 10 beta H, 20 alpha form) by spectral
data and confirmed by X-ray diffraction methods.