dipyridamole

noun

di·​pyr·​i·​dam·​ole (ˈ)dī-ˌpir-ə-ˈdam-ˌȯl  -ˌōl 

: a drug C₂₄H₄₀N₈O₄ that inhibits the activation and aggregation of platelets and is used chiefly to prevent blood clot formation

Note: Dipyridamole is marketed under the trademark Persantine and when used in combination with aspirin, under the trademark Aggrenox.