epsilon-isorhodomycinone

(1R)-2-Ethyl-1,2,3,4,6,11-hexahydro-2α,4α,5,7,10,12-hexahydroxy-6,11-dioxo-1-naphthacenecarboxylic acid methyl ester

(1R)-2-Ethyl-2α,4α,5,7,10,12-hexahydroxy-6,11-dioxo-1,2,3,4,6,11-hexahydronaphthacene-1β-carboxylic acid methyl ester