Synonyms: Dipyridamole Related Compound A, Dipyridamole Impurity A,2,2′-[[4,6,8-Tri(piperidin-1-yl)-pyrimido[5,4-d]pyrimidin-2-yl]nitrilo]diethanol, 2,2′-((4,6,8-Tri(piperidin-1-yl)-pyrimido[5,4-d]pyrimidin-2-yl)nitrilo)diethanol, 2,2′-[[4,6,8-Tri(piperidin-1-yl)-pyrimido[5,4-d]pyrimidin-2-yl]nitrilo]diethanol