['CC(C)COCCCN', 'O=CNCCNc1ccccc1[N+](=O)[O-]', 'CC(C)COCCCNC=O', 'NCCNc1ccccc1[N+](=O)[O-]', 'CC(C)C', 'O=C(NCCCO)NCCNc1ccccc1[N+](=O)[O-]', 'CC(C)CO', 'CCCNC(=O)NCCNc1ccccc1[N+](=O)[O-]', 'CCCOCC(C)C', 'NC(=O)NCCNc1ccccc1[N+](=O)[O-]', 'CCNc1ccccc1[N+](=O)[O-]', 'CC(C)COCCCNC(N)=O', 'Nc1ccccc1[N+](=O)[O-]', 'CCNC(=O)NCCCOCC(C)C', 'O=[N+]([O-])c1ccccc1', 'CC(C)COCCCNC(=O)NCCN']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.