['CC(C)N', 'O=CCNC(=O)c1ccc(Br)c([N+](=O)[O-])c1', 'CC(C)NC(=O)CN', 'O=Cc1ccc(Br)c([N+](=O)[O-])c1', 'CCC', 'NC(=O)CNC(=O)c1ccc(Br)c([N+](=O)[O-])c1', 'CC(=O)NC(C)C', 'NC(=O)c1ccc(Br)c([N+](=O)[O-])c1', 'CC(C)NC(=O)CNC=O', 'O=[N+]([O-])c1ccccc1Br']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.