Bivalirudin is what

Bivalirudin is what? For many people this is a strange object, and here's the introduction to it:

Than cutting as a white to gray powder, is a synthetic anticoagulants, is produced by the natural hirudin analogues, is made up of 20 amino acid polypeptide, molecular formula: C98H138N24O33, high affinity to combine with thrombin and specific inhibition of thrombin activity, catalytic and induced by inhibition of thrombin.