N-[9-[(2′S,6aR,8R,9aR)-Dihydro-2,2,4,4-tetrakis(1-methylethyl)spiro[6H-furo[3,2-f]-1,3,5,2,4-trioxadisilocin-9(8H),2′-oxiran]-8-yl]-9H-purin-6-yl]benzamide

2′-Deoxy-5-[3-[[4-[[6-[[5-[(3aS,4S,6aR)-hexahydro-2-oxo-1H-thieno[3,4-d]imidazol-4-yl]-1-oxopentyl]amino]-1-oxohexyl]amino]-1-oxobutyl]amino]-1-propyn-1-yl]cytidine 5′-(tetrahydrogen triphosphate)