for the following products
4-Nitrophenyl 2-O-(2,3,4,6-tri-O-acetyl-alpha-D-mannopyranosyl)-alpha-D-mannopyranoside | p-Nitrophenyl 2-O-beta-D-glucopyranosyl-beta-D-glucopyranoside 2',3',4',6'-tetraacetate and 4-Nitrophenyl 2-O-(2,3,4,6-tetra-O-acetyl-beta-D-glucopyranosyl)-beta-D-glucopyranoside
