(2R,3R,4R)-4-Hydroxymethyl-3-mercapto-oxetane-2-carboxylic acid dimethylamide

(2R,3R,4R)-4-(tert-Butyl-diphenyl-silanyloxymethyl)-3-(4-methoxy-benzylsulfanyl)-oxetane-2-carbaldehyde

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

(2R,3R,4R)-4-Azidomethyl-3-mercapto-oxetane-2-carboxylic acid methyl ester

(4R,5S,6S)-3-((2R,3R,4R)-2-Azidomethyl-4-methoxycarbonyl-oxetan-3-ylsulfanyl)-6-((R)-1-hydroxy-ethyl)-4-methyl-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester