Using O=C(O)C(SCc1ccccc1)C(=O)O, CC(=O)c1ccc2ccccc2c1 to produce O=c1oc(-c2ccc3ccccc3c2)cc(O)c1SCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.