Task: Please answer the following question about the molecule with SMILES CCCCC1=NC2(CCCC2)C(=O)N1Cc1ccc(-c2ccccc2S(=O)(=O)Nc2noc(C)c2C)c(COCC)c1.
Request: What is the definition of this compound's USAN stem?
Answer: endothelin receptor antagonists
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
CCCCC1=NC2(CCCC2)C(=O)N1Cc1ccc(-c2ccccc2S(=O)(=O)Nc2noc(C)c2C)c(COCC)c1
CCCCC1=NC2(CCCC2)C(=O)N1Cc1ccc(-c2ccccc2S(=O)(=O)Nc2noc(C)c2C)c(COCC)c1
2-[4-[(2-butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3-yl)methyl]-2-(ethoxymethyl)phenyl]-N-(4,5-dimethyl-1,2-oxazol-3-yl)benzenesulfonamide
What is the definition of this compound's USAN stem?