4-Formyl-phenyl 2,3,4,6-tetra-O-acetyl-β-d-galactopyran-oside.

The galactose ring in the title compound, C(21)H(24)O(11), has a chair conformation with the substituted benzene ring occupying an equatorial position. The crystal packing features C-H⋯O inter-actions that lead to the formation of supra-molecular layers in the ab plane.

4-Formyl-phenyl 2,3,4,6-tetra-O-acetyl-β-d-glucopyran-oside.

The pyran-oside ring in the title compound, C(21)H(24)O(11), has a chair conformation with the substituted benzene ring occupying an equatorial position. The crystal packing is dominated by C-H⋯O inter-actions that lead to the formation of supra-molecular layers in the ab plane.