Using Brc1ncccn1, Cn1cc(-c2cc3cnc(Br)cc3[nH]2)cn1 to produce Cn1cc(-c2cc3cnc(Br)cc3n2-c2ncccn2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.