Using OB(O)c1cccnc1, CC(C)(C)OC(=O)NCC1OCCc2sc(Br)cc21 to produce CC(C)(C)OC(=O)NCC1OCCc2sc(-c3cccnc3)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.