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