['CC(C)(C)C(=O)NCC=O', 'CNCc1ccc(F)cc1F', 'CC(C)(C)C=O', 'CN(Cc1ccc(F)cc1F)C(=O)CN', 'Cc1ccc(F)cc1F', 'CNC(=O)CNC(=O)C(C)(C)C', 'CC(C)(C)C(N)=O', 'CC(=O)N(C)Cc1ccc(F)cc1F', 'Fc1cccc(F)c1', 'CN(C)C(=O)CNC(=O)C(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.