Using CC(C)(C)C(=O)CBr, CCOC(=O)c1cc2cc(C(CC)(CC)c3ccc(O)c(C)c3)ccc2s1 to produce CCOC(=O)c1cc2cc(C(CC)(CC)c3ccc(OCC(=O)C(C)(C)C)c(C)c3)ccc2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.