Using C=C(C)C(=O)O, CCCC1CCC(C(=O)OCC(C)(C)CBr)CC1 to produce C=C(C)C(=O)OCC(C)(C)COC(=O)C1CCC(CCC)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.