Synthesis and in vitro cytotoxicity of C(20)(RS)-camptothecin analogues modified at both B (or A) and E ring

Synthesis and in vitro cytotoxicity of C(20)(RS)-camptothecin analogues modified at both B (or A) and E ring Novel C-ring analogues of 20( S )-camptothecin. Part 3: synthesis and their in vitro cytotoxicity of A-, B- and C-ring analogues Synthesis and in vitro cytotoxicity of (RS)-20-desethyl-20-substituted camptothecin analogues Synthesis and in vitro cytotoxicity of hexacyclic camptothecin analogues Synthesis and antitumor activity of 7-substituted 20(RS)-camptothecin analogues Novel hexacyclic camptothecin derivatives. Part 1: Synthesis and cytotoxicity of camptothecins with an A-ring fused 1,3-oxazine ring Plant antitumor agents. 25. Total synthesis and antileukemic activity of ring A substituted camptothecin analogs. Structure-activity correlations Synthesis and cytotoxic activity of alkylidene- and alkyl-substituted camptothecins Regioselective synthesis and cytotoxicities of camptothecin derivatives modified at the 7-, 10- and 20-positions 7-Cycloalkylcamptothecin derivatives: Preparation and biological evaluation