2,4-Anhydro-D-lyxonic acid Methyl Ester 5-(4-Methylbenzenesulfonate)

(2R,3R,4R)-3-Acetylsulfanyl-4-(toluene-4-sulfonyloxymethyl)-oxetane-2-carboxylic acid methyl ester

(2R,3R,4R)-4-(tert-Butyl-diphenyl-silanyloxymethyl)-3-(4-methoxy-benzylsulfanyl)-oxetane-2-carboxylic acid dimethylamide