Ximelagatran anticoagulant drug. Molecular model showing the structure of the anticoagulant drug ximelagatran (marketed as Exanta). Atoms are represented as rods and colour-coded: carbon (yellow), hydrogen (white), nitrogen (green) and oxygen (blue). Ximelagatran is used to treat blood clotting disorders. It belongs to a class of drugs known as direct thrombin inhibitors and is the first of these drugs to be available in oral form. Ximelagatran is converted in the body to melagatran, a compound that inhibits thrombin, the final step in the clotting activation pathway.