Using O=S([O-])[O-], Brc1ccc(P(c2ccccc2)c2ccc(Br)cc2)cc1 to produce O=P(c1ccccc1)(c1ccc(Br)cc1)c1ccc(Br)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.