Using CCS(=O)(=O)c1ccc(Oc2cc3[nH]c(-c4ccccn4)nc3cc2C(O)C(=O)OC)cc1 to produce CCS(=O)(=O)c1ccc(Oc2cc3[nH]c(-c4ccccn4)nc3cc2C(O)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.