['CC(C#N)CN(C)CC=O', 'COc1ccc(C2=CCNCC2)cc1', 'CO', 'CC(C#N)CN(C)CC(=O)N1CC=C(c2ccccc2)CC1', 'CNCC(C)C#N', 'COc1ccc(C2=CCN(C(C)=O)CC2)cc1', 'CC(C)C#N', 'CNCC(=O)N1CC=C(c2ccc(OC)cc2)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1=C(c2ccccc2)CCNC1.