Using COC(=O)C1(c2ccc(CN3CCN(c4ccc(F)cc4)CC3)cc2)CC1 to produce O=C(O)C1(c2ccc(CN3CCN(c4ccc(F)cc4)CC3)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.