Synonyms: Dipyridamole USP Related Compound C, Dipyridamole USP RC C, 2,2′-[[6-Chloro-4,8-di(piperidin-1-yl)pyrimido[5,4-d]pyrimidin-2-yl]nitrilo]diethanol, Dipyridamole Related Compound C, Dipyridamole Impurity C,2,2′-[[6-Chloro-4,8-di(piperidin-1-yl)pyrimido[5,4-d]pyrimidin-2-yl]nitrilo]diethanol, Dipyridamole Imp. C (EP), 2,2′-[[6-Chloro-4,8-di(piperidin-1-yl)pyrimido[5,4-d]pyrimidin-2-yl]nitrilo]diethanol, Dipyridamole Imp. C (EP)