['CC(C)(C)NCC=O', 'CC(C)(C)C(=O)Nc1cccc(N)c1', 'CC(C)(C)C=O', 'CC(C)(C)NCC(=O)Nc1cccc(N)c1', 'CC(C)C', 'CC(C)(C)C(=O)Nc1cccc(NC(=O)CN)c1', 'CC(C)(C)N', 'CC(=O)Nc1cccc(NC(=O)C(C)(C)C)c1', 'CC(C)(C)NCC(N)=O', 'CC(C)(C)C(=O)Nc1ccccc1', 'CC(C)(C)C(N)=O', 'CC(C)(C)NCC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.