4,6-di-O-acetyl-3-O-(N-acetylcarbamoyl)-1,2-O-(1-ethoxyethylidene)-α-D-mannopyranose

1,6-anhydro-3,4-di-O-benzyl-2-O-<2,4,6-tri-O-acetyl-3-O-(acetylcarbamoyl)-α-D-mannopyranosyl>-β-L-gulopyranose