Diethanolamine Dipyridamole

Dicyclohexylguanidium adenosine 5 -phosphoramidate Adenosine triphosphate Diethanolamine Dipyridamole Ditazol... 

Urea maybe reacted with acetoacetic ester and that product nitrated to give 5-nitro-orotec acid That is hydrogenated, then reacted with urea and potassium cyanate to give tetrahydroxypy-imidopyrimidine. The tetrahydroxy compound Is converted to the tetrachloro compound POCI3. Reaction with diethanolamine and then with piperidine gives dipyridamole. 

---