Using O=C([O-])[O-], CC1(C)C(=O)NC(=O)N1c1nc2c(s1)CCOc1cc(Br)ccc1-2 to produce CN1C(=O)N(c2nc3c(s2)CCOc2cc(Br)ccc2-3)C(C)(C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.