['CC(C)(C)NCC=O', 'CNCc1cccc(C#N)c1', 'Cc1cccc(C#N)c1', 'CNC(=O)CNC(C)(C)C', 'CC(C)(C)N', 'CC(=O)N(C)Cc1cccc(C#N)c1', 'CC(C)C', 'CN(Cc1cccc(C#N)c1)C(=O)CN', 'N#Cc1ccccc1', 'CN(C)C(=O)CNC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.