8-O-tert-butyldimethylsilyl-3-methoxycarbonyl-2-methylduocarmycin B2

(S)-8-Chloromethyl-4-hydroxy-2-methyl-7,8-dihydro-3H-pyrrolo[3,2-e]indole-1,6-dicarboxylic acid 6-tert-butyl ester 1-methyl ester

(S)-4-Benzyloxy-8-chloromethyl-2-methyl-7,8-dihydro-3H-pyrrolo[3,2-e]indole-1,6-dicarboxylic acid 6-tert-butyl ester 1-methyl ester

(S)-4-Benzyloxy-8-hydroxymethyl-2-methyl-7,8-dihydro-3H-pyrrolo[3,2-e]indole-1,6-dicarboxylic acid 6-tert-butyl ester 1-methyl ester

(S)-8-Acetoxymethyl-4-benzyloxy-2-methyl-7,8-dihydro-3H-pyrrolo[3,2-e]indole-1,6-dicarboxylic acid 6-tert-butyl ester 1-methyl ester