prov:value
| - A vinblastine group of the formula ##STR10## wherein R2 is a hydrogen atom or a C2 -C3 alkanoyl group, R3 is a hydrogen atom, straight or branched C1 -C8 alkyl, hydroxy - C1 -C8 -alkyl, carboxy -C1 -C8 -alkyl, amido -C1 -C8 - alkyl, amino -C1 -C8 -alkyl or hydroxyalkyl, guanadino -C1 -C8 - alkyl, sulfydryl -C1 -C8 alkyl, methylthio-ethyl, benzyl, hydroxy-benzyl, or a group: ##STR11## or R3 togethe
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