Using COc1ccc2c(-c3ccccc3)n[nH]c(=O)c2c1, O=P(Cl)(Cl)Cl to produce COc1ccc2c(-c3ccccc3)nnc(Cl)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.