Using CO/N=C(\C(=O)N[C@@H]1C(=O)N2C(C(=O)[O-])=C(CC3C=CC(=O)O3)CS[C@H]12)c1csc(N)n1, CC(C)(C)C(=O)OCBr to produce CO/N=C(\C(=O)N[C@@H]1C(=O)N2C(C(=O)OCOC(=O)C(C)(C)C)=C(CC3C=CC(=O)O3)CS[C@H]12)c1csc(N)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.