abstract |
In a cytotoxic compound of the general formula (I) R is H or methyl or methylene substituted by C 1 -C 4 straight or branched alkyl, R 1 is selected from the group consisting of H, C 1 -C 4 straight or branched alkyl, methoxy, methoxy substituted by from one to three fluorine, halogen; R 2 is H or C 1 -C 4 straight or branched alkyl; X is CH or N; Y is CH or N. |