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