Using Clc1cc(Cl)cc(C[P+](c2ccccc2)(c2ccccc2)c2ccccc2)c1, O=C1CCC2(CC1)OCCO2 to produce Clc1cc(Cl)cc(C=C2CCC3(CC2)OCCO3)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.