['CC=O', 'C[C@@H](N)C(=O)N(C)Cc1ccccc1', 'CC(=O)N[C@H](C)C=O', 'CNCc1ccccc1', 'CC(N)=O', 'CCC(=O)N(C)Cc1ccccc1', 'Cc1ccccc1', 'CNC(=O)[C@@H](C)NC(C)=O', 'c1ccccc1', 'CC(=O)N[C@H](C)C(=O)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.