for the building blocks of the pseudomurein sugar strands , i.e . for the monosaccharides beta-d-n-acetylglucosamine ( nag ) and alpha-l-n-acetyltalosaminuronic acid ( nat ) , both in c1 ring conformation , as well as for their 1,3 and 1,4 linked disaccharides , the favoured conformations were obtained .
C0007004
sugar
C0026492
monosaccharides