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(CCCCN(C)C)C(=O)CN1CC(c2cc(CO)c3c(c2)OCO3)C(C(=O)O)C1CCN1CCC(=O)N(C)C1=O
assistant