2,2-Dimethyl-propionic acid (1R,2R)-1-acetoxy-7-(2,2-dimethyl-propionyloxy)-2-hydroxy-2-methyl-6,11-dioxo-1,2,3,4,6,11-hexahydro-naphthacen-5-yl ester 在
sodium hydroxide 、
溴 、
pyridinium chlorochromate 作用下,
生成
9-epi-8-demethoxy-7-O-(2,3,6-trideoxy-3-(trifluoroacetamido)-α-L-lyxo-hexopyranosyl)aranciamycinone