1 6PY 5-acetamido-2,6-anhydro-4-carbamimidamido-3,4,5-trideoxy-7-O-[(2-methoxyethyl)carbamoyl]-D-glycero-D-galacto-non-2-enon ic acid 1.000 2 LNV 5-acetamido-2,6-anhydro-4-carbamimidamido-3,4,5-trideoxy-7-O-methyl-D-glycero-D-galacto-non-2-enonic acid 0.800 3 ZMR Zanamivir 0.710