['Cc1cc(C)c(N)c(C)c1', 'CC(C)CCCNC(=O)NCC=O', 'CC(C)CCCNC=O', 'Cc1cc(C)c(NC(=O)CN)c(C)c1', 'CC(C)CCCN', 'Cc1cc(C)c(NC(=O)CNC=O)c(C)c1', 'CC(C)CCCNC(N)=O', 'CC(=O)Nc1c(C)cc(C)cc1C', 'CCCC(C)C', 'Cc1cc(C)c(NC(=O)CNC(N)=O)c(C)c1', 'Cc1cc(C)cc(C)c1', 'CC(C)CCCNC(=O)NCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.