Using Cn1cc(-c2cc3c(ccn3CCO)cc2F)c2c(Br)ccnc21 to produce Cn1cc(-c2cc3c(cc2F)CCN3CCO)c2c(Br)ccnc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.