Using CCOC(C)=O, Cc1cc2nc(N)sc2c(-c2ccc(Cl)cc2)c1[C@H](OC(C)(C)C)C(=O)O to produce COC(=O)[C@@H](OC(C)(C)C)c1c(C)cc2nc(N)sc2c1-c1ccc(Cl)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.