You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a thrombin inhibitor and is anti coagulant.
user
NCCCC(NC(=O)NC(CC(N)=O)CC1CCCCC1)C(=O)O
assistant