methyl 3-acetamido-5-O-acetyl-2,3,6-trideoxy-β-D-ribo-hexofuranoside

methyl 2,3,6-trideoxy-3-trifluoroacetamido-5-O-trifluoracetyl-α-L-lyxo-hexofuranoside

methyl 2,3,6-trideoxy-3-(trifluoroacetamido)-5-O-(trifluoroacetyl)-α-D-ribo-hexofuranoside