124505-87-9 4H-Imidazo(4,5-b)pyridine-4-hexanoic acid, alpha-amino-2-(((4S)-4-amino-4-carboxybutyl)amino)-, (alphaS)- 4H-Imidazo(4,5-b)pyridine-4-hexanoic acid, alpha-amino-2-((4-amino-4-carboxybutyl)amino)-, (S-(R*,R*))- Pentosidine