['CNCCC#N', 'O=CCN1CCN(c2ccc([N+](=O)[O-])nc2)CC1', 'CCC#N', 'CNC(=O)CN1CCN(c2ccc([N+](=O)[O-])nc2)CC1', 'CC(=O)N(C)CCC#N', 'O=[N+]([O-])c1ccc(N2CCNCC2)cn1', 'O=[N+]([O-])c1ccccn1', 'CN(CCC#N)C(=O)CN1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cncc(N2CCNCC2)c1.