| abstract |
Anthracycline glycosides of general formula (I), wherein Z is hydrogen or methoxy; X represents hydrogen or hydroxy; R1 represents hydrogen, fluorine, hydroxy, methoxy or amino; R2 and R3 both represent hydroxy or one of R2 and R3 is hydrogen, nitro or amino and the other is hydroxy; and R4 and R5 represent hydrogen or one of R4 and R5 is hydrogen and the other is hydroxy; and pharmaceutically acceptable salts thereof; with the provisos that: (i) when R2 and R3 are both hydroxy and Z is hydrogen then R1 represents hydroxy, fluorine or amino, and (ii) when both Z and R1 are methoxy and R2 and R3 are both hydroxy then R5 is hydroxy or both R4 and R5 are hydrogen. |