Using CC(C)(C)OC(=O)N1CCc2ccc(Cl)c(CBr)c2CC1, CC(=O)Sc1cn(C(=O)OC(C)(C)C)c(C)n1 to produce Cc1ncc(SCc2c(Cl)ccc3c2CCN(C(=O)OC(C)(C)C)CC3)[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.