The molecule is a monocarboxylic acid anion that is the conjugate base of neopentalenolactone D, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a neopentalenolactone D.
(1S,4aR,6aS,9aR)-1,8,8-trimethyl-3-oxo-1,4,4a,6a,7,9-hexahydropentaleno[6a,1-c]pyran-5-carboxylate