Using COC(=O)C(CSC(=O)C(Cc1cncn1C(=O)OC(C)(C)C)NC(=O)CCNC(=O)OC(C)(C)C)NC(C)=O to produce COC(=O)[C@H](CSC(=O)[C@H](Cc1cnc[nH]1)NC(=O)CCN)NC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.