Using COC(=O)[C@H](COC(C)(C)C)NC(=O)[C@@H](N)[C@@H](C)OC(C)(C)C, CC(=O)NCSC[C@H](NC(=O)[C@H](CSC(c1ccccc1)(c1ccccc1)c1ccccc1)NC(c1ccccc1)(c1ccccc1)c1ccccc1)C(=O)O to produce COC(=O)[C@H](COC(C)(C)C)NC(=O)[C@@H](NC(=O)[C@H](CSCNC(C)=O)NC(=O)[C@H](CSC(c1ccccc1)(c1ccccc1)c1ccccc1)NC(c1ccccc1)(c1ccccc1)c1ccccc1)[C@@H](C)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.