Using O=C(CCC(CP(=O)(OCc1ccccc1)OCc1ccccc1)C(=O)OCc1ccccc1)OCc1ccccc1 to produce O=C(O)CCC(CP(=O)(O)O)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.