['CCOCC(C)N', 'CC(=O)c1ccc(NC=O)cc1', 'CCOCC(C)NC=O', 'CC(=O)c1ccc(N)cc1', 'CC', 'CC(=O)c1ccc(NC(=O)NC(C)CO)cc1', 'CCO', 'CC(=O)c1ccc(NC(=O)NC(C)C)cc1', 'CCCOCC', 'CC(=O)c1ccc(NC(N)=O)cc1', 'CC(=O)c1ccccc1', 'CCOCC(C)NC(N)=O', 'CC=O', 'CCOCC(C)NC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.