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): It belongs to the endothelin antagonist class of molecules.
user
CCCCC1=C(C(=O)O)C(c2ccc3c(c2)OCO3)Oc2ccc(C(C)C)cc21
assistant