['CC(C)CNC(=O)CN', 'COc1ccc(C=O)cc1', 'CC(C)CN', 'COc1ccc(C(=O)NCC=O)cc1', 'CO', 'CC(C)CNC(=O)CNC(=O)c1ccccc1', 'CC(=O)NCC(C)C', 'COc1ccc(C(N)=O)cc1', 'CC(C)C', 'COc1ccc(C(=O)NCC(N)=O)cc1', 'COc1ccccc1', 'CC(C)CNC(=O)CNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.