methyl 2,3,4,6-tetradeoxy-3,4-epimino-3-C-methyl-α-D-ribo-hexopyranoside

methyl 2,3,6-trideoxy-3-C-methyl-3-trifluoroacetamido-α-D-ribo-hexopyranoside

methyl 2,3,6-trideoxy-3-C-methyl-3-trifluoroacetamido-α-D-erythro-hexopyranosid-4-ulose