Using CCOC(=O)C(=O)OCC, Cc1cccnc1NC(=O)OC(C)(C)C to produce CCOC(=O)C1(O)Cc2cccnc2N1C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.