['CC(C)C', 'CC1(c2cccs2)NC(=O)N(CCO)C1=O', 'CC(C)(C)O', 'CCN1C(=O)NC(C)(c2cccs2)C1=O', 'CCOC(C)(C)C', 'CC1(c2cccs2)NC(=O)NC1=O', 'c1ccsc1', 'CC1NC(=O)N(CCOC(C)(C)C)C1=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1NC(=O)C(c2cccs2)N1.