Using Cc1cccc(-c2nc(O)cc(-c3ccccc3Cl)n2)n1, O=P(Cl)(Cl)Cl to produce Cc1cccc(-c2nc(Cl)cc(-c3ccccc3Cl)n2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.