The molecule is a zwitterion obtained by transfer of a proton from the 5-hydroxy to the tertiary amino group of aclacinomycin N. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of an aclacinomycin N(1+). It is a tautomer of an aclacinomycin N.
(1R,2R,4S)-4-[(2R,4S,5S,6S)-4-(dimethylazaniumyl)-5-[(2S,4S,5S,6S)-4-hydroxy-5-[(2S,5S,6S)-5-hydroxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxy-6-methyloxan-2-yl]oxy-2-ethyl-2,7-dihydroxy-1-methoxycarbonyl-6,11-dioxo-3,4-dihydro-1H-tetracen-5-olate