prov:value
| - g the formula ##STR9## wherein n=1 or 2 and R2 is a member selected from the group consisting of C1-8 alkyl, C1-8 alkoxy, cyano, methylenedioxy, formyl, hydroxy, nitro, amino, amido, chloro, bromo, iodo, fluoro, aminomethyl, trifluoromethyl, azido, and hydrazinyl groups, R3 is H or C1-8 alkyl; and R4 is a side-chain of one of the twenty naturally occurring amino acids, to produce said camptothecin
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