methyl 2-O-allyl 6-O-benzyl-3,4-O-isopropylidene-α-D-altropyranoside

methyl 6-O-benzyl-3,4-O-isopropylidene-2-O-{[2-(trimethylsilyl)ethoxy]methyl}-α-D-allopyranoside

methyl 2-O-allyl-4,6-O-benzylidene-α-D-altropyranoside