Using CC(C)(C)OC(=O)N[C@@H](Cc1ccccc1)C(=O)O, CSCC[C@@H](N)C(=O)NCC(=O)N[C@@H](Cc1ccccc1)C(=O)NC1C2CC3CC(C2)CC1C3 to produce CSCC[C@@H](NC(=O)[C@H](Cc1ccccc1)NC(=O)OC(C)(C)C)C(=O)NCC(=O)N[C@@H](Cc1ccccc1)C(=O)NC1C2CC3CC(C2)CC1C3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.