The molecule is a hydroxy monocarboxylic acid anion that is the conjugate base of all-trans-4-hydroxyretinoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of an all-trans-4-hydroxyretinoic acid.
(2E,4E,6E,8E)-9-(3-hydroxy-2,6,6-trimethylcyclohexen-1-yl)-3,7-dimethylnona-2,4,6,8-tetraenoate