You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): The molecule is a endothelin antagonist.
user
CCCCN(CCN)C(=O)CN1CC(c2cc(OC)c3c(c2)OCO3)C(C(=O)O)C1CCCc1ccccc1OC
assistant