Using CCOCC, CCOC(=O)Cc1ccc(SC(=C=O)c2ccccc2Cl)cc1 to produce O=C(O)Cc1ccc2c(c1)C(=O)c1ccccc1CS2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.