Using CCc1ccc(Nc2ncc(CCc3ccnc(O)c3)c3ccccc23)cc1Br, O=P(Cl)(Cl)Cl to produce CCc1ccc(Nc2ncc(CCc3ccnc(Cl)c3)c3ccccc23)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.