Using COC(=O)c1ccc(C=O)cc1, c1ccc([P+](Cc2n[nH]c3ccccc23)(c2ccccc2)c2ccccc2)cc1 to produce COC(=O)c1ccc(/C=C/c2n[nH]c3ccccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.