Using CCOCC, O=C(O)c1cccc2c(O)nc(C(F)(F)c3ccc(F)cn3)nc12 to produce COC(=O)c1cccc2c(=O)[nH]c(C(F)(F)c3ccc(F)cn3)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.