(3aS,3bR,10bR,10cS,13aR,13bS)-6-methoxy-2,2-dimethyl-3b,4,10b,10c,13a,13b-hexahydro-[1,3,2]dioxathiolo[4,5-a]bis([1,3]dioxolo)[4,5-c:4',5'-j]phenanthridin-5(3aH)-one 12,12-dioxide

(3aS,4R,5R,6S,7R,7aS)-4-Azido-7'-methoxy-2,2-dimethyl-6,7-bis-triethylsilanyloxy-3a,4,5,6,7,7a-hexahydro-[5,5']bi[benzo[1,3]dioxolyl]

(3aS,4R,5R,6S,7R,7aS)-6'-Bromo-4-isocyanato-7'-methoxy-2,2-dimethyl-6,7-bis-triethylsilanyloxy-3a,4,5,6,7,7a-hexahydro-[5,5']bi[benzo[1,3]dioxolyl]