The molecule is a phenolate anion that is the conjugate base of ustilaginoidin A, obtained by deprotonation of the two hydroxy groups at positions 5 and 5'. It is the major microspecies at pH 7.3. It is a conjugate base of an ustilaginoidin A.
9-(4,6-dihydroxy-2-methyl-5-oxido-8-oxobenzo[g]chromen-9-yl)-4,6-dihydroxy-2-methyl-8-oxobenzo[g]chromen-5-olate