Propanamide, N-[7-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-[[bis(1-methylethyl)amino](2-cyanoethoxy)phosphino]-2-deoxy-β-D-erythro-pentofuranosyl]-4,7-dihydro-4-oxo-5-[5-[(trifluoroacetyl)amino]-1-pentynyl]-1H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-

Propanamide, N-[7-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-4,7-dihydro-4-oxo-5-[5-[(trifluoroacetyl)amino]-1-pentynyl]-1H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-

Propanamide, N-[7-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-3-O-(hydroxyphosphinyl)-2-deoxy-β-D-erythro-pentofuranosyl]-5-(1-hexynyl)-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-

Propanamide, N-[7-[5-O-[bis(4-methoxyphenyl)phenylmethyl]-2-deoxy-β-D-erythro-pentofuranosyl]-5-(1-hexynyl)-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-

Propanamide, N-[7-(2-deoxy-β-D-erythro-pentofuranosyl)-5-(1-hexynyl)-4,7-dihydro-4-oxo-1H-pyrrolo[2,3-d]pyrimidin-2-yl]-2-methyl-

4H-Pyrrolo[2,3-d]pyrimidin-4-one, 2-amino-5-(5-amino-1-pentynyl)-7-(2-deoxy-β-D-erythro-pentofuranosyl)-1,7-dihydro-

rel-4,8-Dimethyl (3aR,4R,8S,9aS,9bS)-octahydro-2-methyl-1,3,5-trioxo-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4,8(5H)-dicarboxylate

rel-4,8-Dimethyl (3aR,4R,8R,9aS,9bS)-octahydro-2-methyl-1,3,5-trioxo-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4,8(5H)-dicarboxylate

rel-Methyl (3aR,4R,8S,9aS,9bS)-octahydro-2,8-dimethyl-1,3,5-trioxo-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4(5H)-carboxylate

rel-Methyl (3aR,4R,8R,9aS,9bS)-octahydro-2,8-dimethyl-1,3,5-trioxo-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4(5H)-carboxylate

rel-Methyl (3aR,4R,8S,9aS,9bS)-octahydro-8-methyl-1,3,5-trioxo-2-phenyl-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4(5H)-carboxylate

rel-Methyl (3aR,4R,8R,9aS,9bS)-octahydro-8-methyl-1,3,5-trioxo-2-phenyl-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-4(5H)-carboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6R,8R,8aS)-8-acetyltetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6R,8S,8aS)-8-acetyltetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6S,8R,8aR)-8-acetyltetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6R,8aS)-7,7-diethoxytetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6S,8aR)-7,7-diethoxytetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-3-(1,1-Dimethylethyl) 6-ethyl (3R,6S,8aR)-7,7,8,8-tetracyanotetrahydro-5-oxo-1H-6,8a-epoxyindolizine-3,6(5H)-dicarboxylate

rel-1,1-Dimethylethyl (3aR,4S,7R,9aS,9bS)-4-acetyldecahydro-1,3,5-trioxo-2-phenyl-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-7-carboxylate

rel-1,1-Dimethylethyl (3aR,4R,7S,9aR,9bS)-4-acetyldecahydro-1,3,5-trioxo-2-phenyl-4,9a-epoxy-9aH-pyrrolo[3,4-g]indolizine-7-carboxylate