Using CCC(CC)C(c1ccc2nc(-c3ccc(C(=O)OC)cc3)sc2c1)n1ccnc1 to produce CCC(CC)C(c1ccc2nc(-c3ccc(C(=O)O)cc3)sc2c1)n1ccnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.