The molecule is a monocarboxylic acid anion resulting from the deprotonation of 9beta-pimara-7,15-dien-19-oic acid; the major species at pH 7.3 It is a conjugate base of a 9beta-pimara-7,15-dien-19-oic acid.
(1S,4aR,4bR,7R,10aR)-7-ethenyl-1,4a,7-trimethyl-3,4,4b,5,6,8,10,10a-octahydro-2H-phenanthrene-1-carboxylate