The molecule is an enolate anion resulting from the deprotonation of the enol moiety of demethyldeoxyspectinabilin. The major species at pH 7.3. It is a conjugate base of a demethyldeoxyspectinabilin.
3,5-dimethyl-2-oxo-6-[(3E,5E,7E,9E)-3,5,7,9-tetramethyl-10-(4-nitrophenyl)deca-3,5,7,9-tetraenyl]pyran-4-olate