Using Cc1ccc(-c2c(C#N)c(CC(C)C)nc3ccc(OCCO)cc23)cc1, CC(C)(C)OC(=O)CBr to produce Cc1ccc(-c2c(C#N)c(CC(C)C)nc3ccc(OCCOCC(=O)OC(C)(C)C)cc23)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.