Using O=C(CCCCCl)C[P+](c1ccccc1)(c1ccccc1)c1ccccc1 to produce O=C(C=P(c1ccccc1)(c1ccccc1)c1ccccc1)CCCCCl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.