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Structures of the anthracyclines used in this study. The arrows indicate epimerization at C-4 in daunosamine (EPI); lack of a methoxy group at C-4 in the aglycone, and intercalation of 2,6-dideoxy-L-fucose between the aglycone and daunosamine (MEN 10755 and MEN 11609); valeryl esterification at C-14 (MEN 11609).
