5-O-(triphenylmethyl)-3-deoxy-2-O-(methanesulfonyl)-D-threo-pentono-1,4-lactone

5-O-(triphenylmethyl)-3-deoxy-1,2-anhydro-D-erythro-pentitol

(3S,5S)-3,5-dihydroxy-6-(trityloxy)hexanenitrile

(3R,5S)-3,5,6-Trihydroxy-hexanoic acid isopropyl ester

isopropyl 2-[(4R,6S)-6-(hydroxymethyl)-2,2-dimethyl-1,3-dioxan-4-yl]acetate