Using CCCCOC(=O)[C@H]1CC[C@H](C(C)(O)c2ncc(Br)s2)CC1 to produce CC(O)(c1ncc(Br)s1)[C@H]1CC[C@H](C(=O)O)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.