Using Nc1nc(O)c2c(n1)-c1cc(Cl)ccc1OCC2, O=P(Cl)(Cl)Cl to produce Nc1nc(Cl)c2c(n1)-c1cc(Cl)ccc1OCC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.