['CNCC(C)C#N', 'O=Cc1cc(C2CC2)nc2ccccc12', 'CC(C)C#N', 'CNC(=O)c1cc(C2CC2)nc2ccccc12', 'CC(C#N)CN(C)C=O', 'c1ccc2nc(C3CC3)ccc2c1', 'C1CC1', 'CC(C#N)CN(C)C(=O)c1ccnc2ccccc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2nc(C3CC3)ccc2c1.