The molecule is a monocarboxylic acid anion that is the conjugate base of phaseic acid; major species at pH 7.3. It is a conjugate base of a phaseic acid.
(2Z,4E)-5-[(1R,5R,8S)-8-hydroxy-1,5-dimethyl-3-oxo-6-oxabicyclo[3.2.1]octan-8-yl]-3-methylpenta-2,4-dienoate