['CC(N)C(=O)NC(C)(C)C', 'O=CCc1ccc2c(c1)CCCC2', 'CC(C)(C)N', 'CC(C=O)NC(=O)Cc1ccc2c(c1)CCCC2', 'CCC(=O)NC(C)(C)C', 'NC(=O)Cc1ccc2c(c1)CCCC2', 'CC(C)C', 'CC(NC(=O)Cc1ccc2c(c1)CCCC2)C(N)=O', 'c1ccc2c(c1)CCCC2', 'CC(=O)NC(C)C(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)CCCC2.