Using CCOc1ccc(Cc2ccc(C(=O)P(=O)(OCC)OCC)s2)cc1 to produce CCOc1ccc(Cc2ccc(C(=O)P(=O)(O)O)s2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.