for the following products
4-Nitrophenyl 2-acetamido-3,6-di-O-acety-2-deoxyl-beta-D-glucopyranoside | p-Nitrophenyl 2-acetamido-2-deoxy-3,6-di-O-acetyl-beta-D-glucopyranoside and 4-Nitrophenyl 2-acetamido-2-deoxy-3,6-di-O-acetyl-beta-D-glucopyranoside
