4-ethoxycarbonyloxy-3-methoxy-carbazole-1,2,9-tricarboxylic acid 9-ethyl ester 1,2-dimethyl ester

cyclohexa-1,3-diene

5-amino-2-methoxy-3,4-dimethylphenol

3-hydroxy-1,2-dimethyl-9H-carbazole

deoxycarbazomycin B