Using O=P(Cl)(Cl)Cl, COC(=O)c1c[nH]c(=O)c2ccn(C3CCCC3)c12 to produce COC(=O)C1=CNC(Cl)c2ccn(C3CCCC3)c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.