methyl-2,3-didehydro-4,7,8,9-tetra-O-acetyl-N-acetylneuraminate
methyl 2,3,4-tri-O-benzoyl-6-O-
N-acetyl-4,7,8,9-tetra-O-acetyl-2-chloro-2-deoxyneuraminic acid methyl ester
methyl (phenyl 5-acetamido-4,7,8,9-tetra-O-acetyl-3,5-dideoxy-2-thio-D-glycerol-β-D-galactonon-2-ulopyranoside)onate
Methyl-(5-acetamido-4,7,8,9-tetra-O-acetyl-2,3,5-tridesoxy-D-glycero-β-D-galacto-2-nonulopyranosylbromid)onat