['CCNCC(C)C#N', 'O=Cc1n[nH]c2ccccc12', 'CC', 'CC(C#N)CNC(=O)c1n[nH]c2ccccc12', 'CC(C)C#N', 'CCNC(=O)c1n[nH]c2ccccc12', 'c1ccc2[nH]ncc2c1', 'CCN(C=O)CC(C)C#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ncc2c1.