You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: The molecule is a endothelin antagonist. Please represent the molecule in SMILES.
user
CC(C)CC(NC(=O)N1CCCCCC1)C(=O)NC(Cc1c[nH]c2ccccc12)c1nc(C(=O)O)c(Cc2ccccc2)o1
assistant