Using CCCCCC(CCCC(CCCCCCC(=O)OC)(C(=O)OC)S(C)(=O)=O)OC(C)=O to produce CCCCCC(CCCC(CCCCCCC(=O)OC)S(C)(=O)=O)OC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.