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