Using O=P(Cl)(Cl)Cl, Cc1nc(C)n2nc(-c3ccccc3)[nH]c(=O)c12 to produce Cc1nc(C)n2nc(-c3ccccc3)nc(Cl)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.