13217-66-8 15453-05-1 2,2'-Azobis(2-amidinopropane) 2,2'-Azobis(2-methylpropionamidine) 2997-92-4 79629-13-3 AAPH ABAP ABAPH Amph cpd Propanimidamide, 2,2'-azobis(2-methyl-