['CC(C)N', 'CC(C)(C)c1ccc2c(Cl)c(C=O)sc2c1', 'CCC', 'CC(C)(C)c1ccc2c(Cl)c(C(N)=O)sc2c1', 'CC(C)NC=O', 'CC(C)(C)c1ccc2c(Cl)csc2c1', 'CC(C)C', 'CC(C)NC(=O)c1sc2ccccc2c1Cl']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2sccc2c1.