['c1ccc2c(c1)OCCO2', 'O=CNNC(=O)CCC(=O)c1ccc(Cl)s1', 'Clc1cccs1', 'O=CCCC(=O)NNC(=O)[C@H]1COc2ccccc2O1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CCC(=O)c1cccs1)NNC(=O)[C@H]1COc2ccccc2O1.