['CC(C)NC(=O)CN', 'Cc1ccc(CCC=O)c(C)c1', 'CC(C)N', 'Cc1ccc(CCC(=O)NCC=O)c(C)c1', 'CC(=O)NC(C)C', 'Cc1ccc(CCC(N)=O)c(C)c1', 'CCC', 'Cc1ccc(CCC(=O)NCC(N)=O)c(C)c1', 'Cc1cccc(C)c1', 'CCC(=O)NCC(=O)NC(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.