3,4-O-Isopropylidene-1,2-di-O-methyl-a-D-galactopyranoside

Methyl 3,4-O-Isopropylidene-2-O-methyl-α-D-galactopyranoside

Methyl 2-O-Methyl-3,4-O-(1-methylethylidene)-a-D-galactopyranoside