SMILES: CC1=C(C(CCC1=O)(C)C)/C=C/C(=C/C=C/C(=C/C(=O)[O-])/C)/C
Description: The molecule is an oxo monocarboxylic acid anion that is the conjugate base of all-trans-4-oxoretinoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3.