['CC(C)CN', 'C[C@H](C=O)Sc1ccc([N+](=O)[O-])cc1', 'CC(C)C', 'C[C@@H](Sc1ccc([N+](=O)[O-])cc1)C(N)=O', 'CCC(=O)NCC(C)C', 'O=[N+]([O-])c1ccc(S)cc1', 'O=[N+]([O-])c1ccccc1', 'CC(C)CNC(=O)[C@@H](C)S']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.