The molecule is a zwitterion obtained by transfer of a proton from the 5-hydroxy to the tertiary amino group of 11-deoxy-beta-rhodomycin; major species at pH 7.3. It is a tautomer of an 11-deoxy-beta-rhodomycin.
(1R,2R,4S)-4-[(2R,4S,5S,6S)-4-(dimethylazaniumyl)-5-hydroxy-6-methyloxan-2-yl]oxy-2-ethyl-1,2,7-trihydroxy-6,11-dioxo-3,4-dihydro-1H-tetracen-5-olate