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