1	RS4	7-ethyl-10-hydroxycamptothecin	1.000
2	EHD	4-ethyl-4-hydroxy-1,12-dihydro-4h-2-oxa-6,12a-diaza-dibenzo[B,H]fluorene-3,13-dione	0.897
3	TTC	(S)-10-[(dimethylamino)methyl]-4-ethyl-4,9-dihydroxy-1h-pyrano[3',4':6,7]inolizino[1,2-B]-quinoline-3,14(4h,12h)-dione	0.818