The molecule is a phenolate anion obtained by deprotonation of 1-hydroxy group of methyl aklanonate. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a methyl aklanonate.
8-hydroxy-3-(2-methoxy-2-oxoethyl)-9,10-dioxo-2-(3-oxopentanoyl)anthracen-1-olate