Using Cc1ccc(S)cc1C(=O)O, Brc1cccc(Nc2ncc(Br)s2)n1 to produce Cc1ccc(Sc2cnc(Nc3cccc(Br)n3)s2)cc1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.