['CCCCO', 'NC(=O)Nc1ccc(C=O)cc1', 'NC=O', 'CCCCOC(=O)c1ccc(N)cc1', 'CCCC', 'NC(=O)Nc1ccc(C(=O)O)cc1', 'NC(N)=O', 'CCCCOC(=O)c1ccccc1', 'CCCCOC=O', 'NC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.