['CCC[C@@H](C)N', 'CN(CC=O)Cc1ccccc1[N+](=O)[O-]', 'CCCCC', 'CN(CC(N)=O)Cc1ccccc1[N+](=O)[O-]', 'CCC[C@@H](C)NC(C)=O', 'CNCc1ccccc1[N+](=O)[O-]', 'Cc1ccccc1[N+](=O)[O-]', 'CCC[C@@H](C)NC(=O)CNC', 'O=[N+]([O-])c1ccccc1', 'CCC[C@@H](C)NC(=O)CN(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.