-1-(4,8-dithiaspiro<2.5>oct-1-yl)-2-(triphenylmethoxy)ethanol

3,4-anhydro-2-deoxy-5-O-(triphenylmethyl)-L-threo-pentose cyclic 1,3-propanediyl mercaptal

3,4-anhydro-2-deoxy-5-O-(triphenylmethyl)-D-threo-pentose cyclic 1,3-propanediyl mercaptal

2-deoxy-3,4-O-(1-methyl-1,1-ethanediyl)-5-O-<(4-methylphenyl)sulfonyl>-D-erythro-pentose cyclic 1,3-propanediyl mercaptal

2-deoxy-4,5-O-(1-methyl-1,1-ethanediyl)-3-O-<(4-methylphenyl)sulfonyl>-D-erythro-pentose cyclic propane-1,3-diyl mercaptal