Using COc1c(CC(C(=O)O)C(=O)O)cccc1C(=O)c1ccc(Cl)cc1 to produce COc1c(CCC(=O)O)cccc1C(=O)c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.