trimethyl-[(8-trimethylsilyloxy-1,4-dioxaspiro[4.6]undec-8-en-9-yl)oxy]silane

methyl 5,5-dimethoxy-2-oxocyclohexane-1-carboxylate

1,5-dicarbomethoxy-3-methoxy-2-pentene

4-{(2R,3R,4R,5R)-2-[2-(4-tert-Butyl-benzoylamino)-6-oxo-1,6-dihydro-purin-9-yl]-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-3-yloxy}-4-methoxy-heptanedioic acid dimethyl ester

4-[(2R,3R,4R,5R)-2-(4-Benzoylamino-2-oxo-2H-pyrimidin-1-yl)-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-3-yloxy]-4-methoxy-heptanedioic acid dimethyl ester