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