['CC(C)O', 'Nc1ccc([N+](=O)[O-])cc1C(=O)OCC=O', 'CC(C)OC(=O)CO', 'Nc1ccc([N+](=O)[O-])cc1C=O', 'CCC', 'Nc1ccc([N+](=O)[O-])cc1C(=O)OCC(=O)O', 'CC(=O)OC(C)C', 'Nc1ccc([N+](=O)[O-])cc1C(=O)O', 'CC(C)OC(=O)COC=O', 'Nc1ccc([N+](=O)[O-])cc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.