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Graphics Interchange Format  |  1999-06-07  |  14.9 KB  |  600x478  |  8-bit (51 colors)
   ocr: 9 5 10, N 11 13 2 N 3 16 17 12 1 14 15 18 Me 20 19 21 OH O 20(S) - camptothecin basic ring structure Substitutions: Compounds Position 7 9 10 9-amino camptothecin H -NH, H Topotecan H - - CHACCH OH CPT-11 -CH,-CH, H ONCNY