55717-54-9 9-Anana 9-O-Acetylsialic acid 9-O-acetyl-N-acetylneuraminic acid D-glycero-D-galacto-2-Nonulosonic acid, 5-(acetylamino)-3,5-dideoxy-, 9-acetate N-Acetyl-9-O-acetylneuraminic acid