Using Brc1ccc(-n2nnc(-c3ccccn3)n2)cc1, [Zn+]c1ccccn1 to produce c1ccc(-c2ccc(-n3nnc(-c4ccccn4)n3)cc2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.