Using CCOC(=O)C[P+](c1ccccc1)(c1ccccc1)c1ccccc1, O=Cc1c(Cl)ccc2cc(Cl)cnc12 to produce CCOC=CC(=O)c1c(Cl)ccc2cc(Cl)cnc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.