Using COCCOCn1nc(-c2ccccc2OC)c2cc(-c3cccc(C(=O)OC)c3)cnc21 to produce COC(=O)c1cccc(-c2cnc3[nH]nc(-c4ccccc4OC)c3c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.