['N#Cc1ccc(N)cc1', 'CC(C)N(CCC=O)CC(N)=O', 'CCC', 'N#Cc1ccc(NC(=O)CCNCC(N)=O)cc1', 'CC(C)NCC(N)=O', 'CCC(=O)Nc1ccc(C#N)cc1', 'CC(N)=O', 'CC(C)NCCC(=O)Nc1ccc(C#N)cc1', 'N#Cc1ccccc1', 'CC(C)N(CCC(N)=O)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.