Using Cn1c(=O)oc2cc(C(=O)CCN3CCN(c4cccc(C(F)(F)F)c4)CC3)ccc21 to produce Cn1c(=O)oc2cc(C(O)CCN3CCN(c4cccc(C(F)(F)F)c4)CC3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.