(R)-3-Hydroxy-3-(2-methoxy-3-methoxymethoxymethyl-6-trimethylsilanyl-pyridin-4-yl)-pentanal

(+)-5-ethyl-1,4,5,8-tetrahydro-5-hydroxy-7-iodo-8-(3-tert-butyldimethylsilyl-2-propynyl)oxepino[3,4-c]pyridine-3,9-dione

(R)-7-(tert-butyldimethylsilyl)-10-(tert-butyloxycarbonylamino)homocamptothecin