Using O=C1CCCCC1=O, COCc1cc(-c2c(S(C)(=O)=O)ccc(C(=O)O)c2Cl)no1 to produce COCc1cc(-c2c(S(C)(=O)=O)ccc(C(=O)OC3=CC(=O)CCC3)c2Cl)no1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.