You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a endothelin antagonist. Please write the SMILES representation of it.
user
CCCCN(C(=O)CN1CC(c2ccc3c(c2)OCO3)C(C(=O)O)C1CN1CCCC1=O)c1ccc[n+](C)c1
assistant