You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: The molecule is a factor xa inhibitor and belongs to the anti thrombotic class of molecules.
user
O=C(c1cc2ncnc(NCc3cc4cc(Cl)ccc4[nH]3)c2cc1Br)N1CC=CC1
assistant