Using C[C@]12CC[C@H]3[C@@H](CCC4=CC(=O)CC[C@@]43C)[C@@H]1CC[C@@H]2C(=O)CO, BrCCCCCBr to produce CC12CCC(=O)C=C1CCC1C2CCC2(C)C(C(=O)COCCCCCBr)CCC12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.