Using COC(=O)[C@H](CC(C)C)N1CC2=C(Oc3c(Cl)cccc3C2)C1=O to produce CC(C)C[C@@H](C(=O)O)N1CC2=C(Oc3c(Cl)cccc3C2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.