methyl 5-acetamido-2,7,8,9-tetra-O-acetyl-3,4,5-trideoxy-D-manno-2-nonulopyranosonate

Methyl 5-acetamido-7,8,9-tri-O-acetyl-2,6-anhydro-3,5-dideoxy-D-glycero-D-talo-non-2-enonate