['NC(=O)NCCCCC=O', 'CCCCCc1ccc(N)cc1', 'NC=O', 'CCCCCc1ccc(NC(=O)CCCCN)cc1', 'NC(N)=O', 'CCCCCc1ccc(NC(=O)CCCC)cc1', 'NC(=O)CCCCNC(N)=O', 'CCCCCc1ccccc1', 'CCCCC', 'NC(=O)NCCCCC(=O)Nc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.