Using COC(=O)[C@H](CCC(=S)N(CCNC(=O)OC(C)(C)C)CCNC(=O)OC(C)(C)C)NC(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)NCCN(CCNC(=O)OC(C)(C)C)C(=S)CC[C@H](NC(=O)OC(C)(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.