2-debenzoyl-2,13-[(10R,9S,3R,E)-9-tert-butoxycarbonylamino-10-hydroxy-3-methyl-1,11-diketoundec-6-enylene]baccatin III

2-debenzoyl-2,13-[(11R,10S,3R,E)-10-tert-butoxycarbonylamino-11-hydroxy-3-methyl-1,12-diketododec-6-enylene]baccatin III

2-debenzoyl-2,13-[(11R,10S,E)-10-tert-butoxycarbonylamino-11-hydroxy-4-oxa-2,3-benzo-1,12-diketododec-6-enylene]baccatin III

7-triethylsilyl-2-debenzoyl-2,13-[(2R,3S,E)-3-tert-butoxycarbonylamino-2-triethylsiloxy-1,10-diketodec-6-enylene]baccatin III