Using Fc1ccc(OC2CCN(c3nc4c(nc3NCC(F)F)CCN(Cc3ccccc3)C4)CC2)c(F)c1 to produce Fc1ccc(OC2CCN(c3nc4c(nc3NCC(F)F)CCNC4)CC2)c(F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.