diethyl (3RS,4SR,5SR,6RS)-3-acetoxymethyl-6-benzyloxy-4,5-dihydroxyhexahydropyridazine-1,2-dicarboxylate

(+/-)-5-t-butyldimethylsilyl-4-deoxy-1,4-bis(ethoxycarbonylamino)-2,3-O-isopropylidene-1-o-methyl-lyxitol