['NC(=O)NCCCCC=O', 'COc1cc(N)cc(OC)c1', 'NC=O', 'COc1cc(NC(=O)CCCCN)cc(OC)c1', 'CO', 'COc1cccc(NC(=O)CCCCNC(N)=O)c1', 'NC(N)=O', 'CCCCC(=O)Nc1cc(OC)cc(OC)c1', 'COc1cccc(OC)c1', 'NC(=O)CCCCNC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.