Using COc1ccc(NN)cc1, O=C(O)CCC(=O)CC(=O)c1cccnc1 to produce COc1ccc(-n2nc(CCC(=O)O)cc2-c2cccnc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.