twenty-three monosaccharides , e.g. , d- or l-pentoses , d- or l-hexoses , heptose , 2- or 6-deoxyhexoses , 2-deoxy-2-aminohexoses , hexuronic acids , and n-acetylmuramic acid , were coupled to the azo dye 4'-n , n-dimethylamino-4-aminoazobenzene by reductive amination using sodium cyanoborohydride as reducing agent and in the presence of pentaerythritol .
C0026492
monosaccharides
C0030894
pentoses