['CO', 'Cc1cc(SCC(=O)O)c2ccccc2n1', 'CC(=O)O', 'COc1cccc2c(S)cc(C)nc12', 'O=C(O)CS', 'COc1cccc2ccc(C)nc12']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ncccc2c1.