1,2,3,6-tetra-O-acetyl-β-D-glucopyranose
p-phenylazophenyl isocyanate
perchloric acid
acetic anhydride
[O3,O4-diacetyl-O1,O6-bis-(4-phenylazo-phenylcarbamoyl)-β-D-fructofuranosyl]-[O2,O3,O4-triacetyl-O6-(4-phenylazo-phenylcarbamoyl)-α-D-glucopyranoside]