SMILES: C[C@H]1[C@H]2C=C([C@H]3[C@]2(C=C1C)[C@@]4(CO4)C(=O)OC3)C(=O)[O-]
Description: The molecule is a monocarboxylic acid anion that is the conjugate base of pentalenolactone, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a pentalenolactone.