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2. A naturally occurring deaminated neuraminic acid, 3-deoxy-D-glycero-D-galacto-nonulosonic acid (KDN). Its unique occurrence at the nonreducing ends of oligosialyl chains in polysialoglycoprotein of rainbow trout eggs.
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4. a) Shirai, R.; Ogura, H. Tetrahedron Lett. 1989, 30, 2263–2264. b) Augé, C.; Gautheron, C.; David, S. Tetrahedron 1990, 46, 201–214. c) Sugai, T.; Shen, G.-J.; Ichikawa, Y.; Wong, C.-H. J. Am. Chem. Soc. 1993, 115, 413–421. for KDN see a) Nakamura, M.; Furuhata, K.; Ogura, H. Chem. Pharm. Bull. 1988, 36, 4807–4813. b) Sugai, T.; Kuboki, A.; Hiramatsu, S.; Okazaki, H.; Ohta, H. Bull. Chem. Soc. Jpn. 1995, 68, 3581.
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