Using O=C(CBr)c1ccc2c(c1)COc1cc3c(cc1-2)CCCC3=O, COC[C@H]1C[C@@H](C(=O)O)N(C(=O)OC(C)(C)C)C1 to produce COC[C@H]1CC(C(=O)OCC(=O)c2ccc3c(c2)COc2cc4c(cc2-3)CCCC4=O)N(C(=O)OC(C)(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.