Dipyridamole EP Impurity A Catalogue S330651 CAS 16982-40-4 M.W MW: 484.64 M.F C25H40N8O2 Specifications FAQs 2,2′-[[4,6,8-Tri(piperidin-1-yl) pyrimido [5,4-d] pyrimidin-2-yl]nitrilo]diethanol