Using OC[C@@H]1CC[C@H]2CN(c3ncc(F)cn3)CCN2C1 to produce O=C[C@@H]1CC[C@H]2CN(c3ncc(F)cn3)CCN2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.