['O=[N+]([O-])c1cccc(O)c1', 'CC(C)CN(CCC#N)C[C@H](C)O', 'O=[N+]([O-])c1ccccc1', 'CC(C)CN(CCC#N)C[C@@H](O)CO', 'CC(C)C', 'N#CCCNC[C@@H](O)COc1cccc([N+](=O)[O-])c1', 'CCC#N', 'CC(C)CNC[C@@H](O)COc1cccc([N+](=O)[O-])c1', 'CC(C)CNCCC#N', 'C[C@@H](O)COc1cccc([N+](=O)[O-])c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.