(-)-O,21-dihydrocamptothecin

4(S)-4-ethyl-4-hydroxy-6-chloro-4,7-dihydro-1H-pyrano[3,4-c]pyridin-3,8-dione

2-[(4-methylphenyl)iminomethyl]aniline

4-乙基-7,8-二氢-4-羟基-1H-吡喃并[3,4-f]吲嗪-3,6,10(4H)-三酮

7-乙基-10-羟基喜树碱中间体