You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: The molecule is a endothelin antagonist.
user
COc1ccc(C2C(C(=O)O)C(c3ccc4c(c3)OCO4)CN2CC=CCC(C)C)cc1
assistant