The molecule is a monocarboxylic acid anion resulting from the deprotonation of the carboxy group of (4S)-4,16-dihydroxyretinoic acid. It is a conjugate base of a (4S)-4,16-dihydroxyretinoic acid.
(2E,4E,6E,8E)-9-[(3S,6S)-3-hydroxy-6-(hydroxymethyl)-2,6-dimethylcyclohexen-1-yl]-3,7-dimethylnona-2,4,6,8-tetraenoate