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