Using O=P(Cl)(Cl)Cl, Cc1cc2c(O)nc(-c3ccccc3)nc2[nH]1 to produce Cc1cc2c(Cl)nc(-c3ccccc3)nc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.