['CC=O', 'CC(C)[C@H](N)C(=O)N(C)Cc1cccc(Cl)c1Cl', 'CC(=O)N[C@H](C=O)C(C)C', 'CNCc1cccc(Cl)c1Cl', 'CC(N)=O', 'CC(C)CC(=O)N(C)Cc1cccc(Cl)c1Cl', 'Cc1cccc(Cl)c1Cl', 'CNC(=O)[C@@H](NC(C)=O)C(C)C', 'Clc1ccccc1Cl', 'CC(=O)N[C@H](C(=O)N(C)C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.