The molecule is a phenolate anion resulting from the deprotonation of the hydroxy group on the middle ring of one of the two dihydroanthracene groups of julichrome Q6-6. The major species at pH 7.3. It is a conjugate base of a julichrome Q6-6.
(5S,6S)-5-[(1R)-1-acetyloxyethyl]-2-[(5S,6S)-5-[(1R)-1-acetyloxyethyl]-1,6,9-trihydroxy-6-methyl-8-oxo-5,7-dihydroanthracen-2-yl]-6,9-dihydroxy-6-methyl-8-oxo-5,7-dihydroanthracen-1-olate