The molecule is the dicarboxylate anion of limonoic acid; major species at pH 7.3. It is a conjugate base of a limonoic acid.
(1S,2'S,3aR,5aR,6R,7S,9aR,9bR)-1-(carboxylatomethyl)-7-[(S)-furan-3-yl(hydroxy)methyl]-9b-(hydroxymethyl)-3,3,5a,7-tetramethyl-5-oxospiro[1,3a,4,8,9,9a-hexahydrobenzo[e][2]benzofuran-6,3'-oxirane]-2'-carboxylate