Using CCOC(=O)c1c(O)nc2cc(C(C)(C)C)ccc2c1C, O=P(Cl)(Cl)Cl to produce CCOC(=O)c1c(Cl)nc2cc(C(C)(C)C)ccc2c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.