| abstract |
The present invention provides imidazopyridazine compounds or imidazothiadiazole compounds of Formula I having the structure: (I) wherein X 1 , X 2 , X 3 , X 4 , X 5 , Y, W, R 1 , R 2 , R 3 , R 4 , R 5 and (II) are as defined herein, or a stereoisomer, tautomer, pharmaceutically acceptable salt, prodrug ester or solvate form thereof. These compounds are inhibitors of platelet aggregation and thus can be used as medicaments for treating or preventing thromboembolic disorders. |