['CC(C)C', 'O=C1NC2(CCOc3ccccc32)C(=O)N1CCO', 'CC(C)(C)O', 'CCN1C(=O)NC2(CCOc3ccccc32)C1=O', 'CCOC(C)(C)C', 'O=C1NC(=O)C2(CCOc3ccccc32)N1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1NC(=O)C2(CCOc3ccccc32)N1.