Using O=P(Cl)(Cl)Cl, COc1ccc(Cc2c[nH]c(=O)c3cccnc23)cn1 to produce COc1ccc(Cc2cnc(Cl)c3cccnc23)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.