['CC(C)(C)N', 'CS(=O)(=O)c1cc(C(=O)NCC=O)cc([N+](=O)[O-])c1', 'CC(C)(C)NC(=O)CN', 'CS(=O)(=O)c1cc(C=O)cc([N+](=O)[O-])c1', 'CC(C)C', 'CS(=O)(=O)c1cc(C(=O)NCC(N)=O)cc([N+](=O)[O-])c1', 'CC(=O)NC(C)(C)C', 'CS(=O)(=O)c1cc(C(N)=O)cc([N+](=O)[O-])c1', 'CC(C)(C)NC(=O)CNC=O', 'CS(=O)(=O)c1cccc([N+](=O)[O-])c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.