Using c1ccc([P+](Cc2cccc3ccccc23)(c2ccccc2)c2ccccc2)cc1, CN1CCC(C=O)CC1 to produce CN1CCC(C=Cc2cccc3ccccc23)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.