Using CCOC(=O)c1c(Cc2ccccc2)csc1N1C(=O)c2ccccc2C1=O to produce O=C(O)c1c(Cc2ccccc2)csc1N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.