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 endothelin antagonist.
user
CCCCN(CCCC)C(=O)[N+]1(CC)CC(c2ccc3c(c2)OCO3)C(C(=O)OCC)C1c1ccc(OC)cc1
assistant