Using Oc1ccc(C[P+](c2ccccc2)(c2ccccc2)c2ccccc2)cc1, O=Cc1cccc2[nH]ccc12 to produce Oc1ccc(C=Cc2cccc3[nH]ccc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.