1-Npana 2-O-(4-Nitrophenyl)-N-acetylneuraminic acid 26055-78-7 26112-88-9 4-Nitrophenyl-5-acetamido-3,5-dideoxy-alpha-D-glycero-D-galacto-2-nonulopyranosidonic acid D-glycero-alpha-D-galacto-2-Nonulopyranosidonic acid, 4-nitrophenyl 5-(acetylamino)-3,5-dideoxy- NP-Nan p-Nitrophenyl N-acetyl-alpha-D-neuraminide p-Nitrophenyl N-acetyl-alpha-neuraminide