Using O=Cc1c(Cl)sc(Cl)c1Cl, CC(=O)C=P(c1ccccc1)(c1ccccc1)c1ccccc1 to produce CC(=O)/C=C/c1c(Cl)sc(Cl)c1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.