Using CC[C@H](NC(=O)OC(C)(C)C)c1nc2ccc(Br)cc2[nH]1, COCCl to produce CC[C@H](NC(=O)OC(C)(C)C)c1nc2ccc(Br)cc2n1COC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.