Using CCOC(=O)Cn1cc(-c2cc(C(F)(F)F)cc3[nH]ncc23)cn1 to produce O=C(O)Cn1cc(-c2cc(C(F)(F)F)cc3[nH]ncc23)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.