['Cc1cc(C)cc(N)c1', 'NC(=O)NCCCCC=O', 'NC=O', 'Cc1cc(C)cc(NC(=O)CCCCN)c1', 'NC(N)=O', 'CCCCC(=O)Nc1cc(C)cc(C)c1', 'Cc1cccc(C)c1', 'NC(=O)CCCCNC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.