(1-2)-Linked N-3-hydroxypropionyl-alpha-D-perosamine 14131-56-7 4-(3-Hydroxypropanamido)-4,6-dideoxy-alpha-D-mannopyranose Apa1-2P D-Mannopyranose, 4-(acetylamino)-4,6-dideoxy- N-Acetylperosamine alpha(1-2)Linked N-acetylperosamine homopolymer