Using Brc1nccs1, C[C@@H]1CN(C(=O)OC(C)(C)C)[C@@H](C=O)CN1C(=O)OC(C)(C)C to produce C[C@@H]1CN(C(=O)OC(C)(C)C)[C@@H](C(O)c2nccs2)CN1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.