['CCO', 'O=CNNC(=O)CCN1c2ccccc2Sc2ccccc21', 'CC', 'O=C(O)NNC(=O)CCN1c2ccccc2Sc2ccccc21', 'CCOC(=O)NNC(=O)CC', 'c1ccc2c(c1)Nc1ccccc1S2']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2c(c1)Nc1ccccc1S2.