2-(N-dansyl-4-aminophenylthio)-N-acetyl-9-O-acetylneuraminic acid

(2S,4S,5R,6R)-5-acetamido-2-[4-[(5-dimethylaminonaphthalen-1-yl)sulfon ylamino]phenyl]sulfanyl-4-hydroxy-6-[(1S,2R)-1,2,3-trihydroxypropyl]ox ane-2-carboxylic acid