Using CCOC(=O)c1c(-c2cccc(OC)c2)csc1N1C(=O)c2ccccc2C1=O to produce COc1cccc(-c2csc(N3C(=O)c4ccccc4C3=O)c2C(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.