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
Cc1cc(C)nc(OC2C(=O)N3CCN(C(=O)c4ccccc4)c4ccccc4C23c2ccccc2)n1
assistant