Using CC(C)(C)OC(=O)CBr, COC(=O)c1sc2c(C3CCCCC3)c(-c3ccc(Cl)cc3)n(C)c2c1C1OCCO1 to produce COC(=O)c1sc2c(C3CCCCC3)c(-c3ccc(Cl)cc3)n(CC(=O)OC(C)(C)C)c2c1C1OCCO1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.