1,1'-Azobis(3-methyl-2-phenylimidazo(1,2-a)pyridinium) 36653-54-0 49564-56-9 53991-79-0 Dazopironium Fazadinium Imidazo(1,2-a)pyridinium, 1,1'-azobis(3-methyl-2-phenyl-