Using O, CC(C)(C)OC(=O)NC(C)(CF)C(=O)OC(C)(C)C to produce CC(C)(C)OC(=O)CNC(C)(CF)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.