['CNC', 'C[C@H](C=O)Sc1nc2ccc(Cl)cc2[nH]1', 'CCC(=O)N(C)C', 'Sc1nc2ccc(Cl)cc2[nH]1', 'C[C@@H](S)C(=O)N(C)C', 'Clc1ccc2nc[nH]c2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]cnc2c1.