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Methanol Formaldehyde 1,3-Dioxolane (+)-2,3-O-BENZYLIDENE-D-THREITOL 2',3'-O-Isopropylideneinosine Nitroglycerin 1,2:5,6-Bis-O-(1-methylethylidene)-D-mannitol Diacetonefructose 2',3'-O-Isopropylideneadenosine (R)-(-)-2,2-Dimethyl-1,3-dioxolane-4-methanol