Using CC1(C)COB(c2ccc3nccnc3c2)OC1, OC(c1cc(Br)cs1)C(F)(F)F to produce OC(c1cc(-c2ccc3nccnc3c2)cs1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.