(4R,5S,6S)-3-((2R,3R,4R)-2-Dimethylcarbamoyl-4-hydroxymethyl-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

2,4-Anhydro-3-thio-D-arabinonic Acid Methyl Ester 5-(4-Methylbenzenesulfonate)

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

2,4-anhydro-3,5-di-O-benzyl-D-lyxonic acid

methyl 2,4-anhydro-5-N-(t-butoxycarbonyl)amino-D-lyxonate