CAS 73208-82-9: methyl (4R,5R,6R)-2,4-diacetoxy-5-[acetyl(methyl)amino]-6-[(1S,2R)-1,2,3-triacetoxypropyl]tetrahydropyran-2-carboxylate

2,4,7,8,9-Penta-O-acetyl-N-acetylneuraminic acid methyl ester

2,4,7,8,9-Penta-O-acetyl-N-acetylneuraminic acid methyl ester (2,4,7,8,9-PNT) is a fluorescent analogue of sialic acid. It is a sensor for the presence of glycopyranoses and its derivative 2-(3'-hydroxyphenyl)-2H-benzotriazole (HPBT) has been used to detect carboxylic groups in proteins. 2,4,7,8,9-PNT has also been used as an affinity label for lysine residues on proteins and to study protein interactions with carbohydrates. The high yield in this synthesis allows for the use of techniques such as crystallography or fluorescence.