Using COC(=O)C(CO)NC(=O)c1ccc(CNC(=O)OC(C)(C)C)cc1 to produce COC(=O)C1COC(c2ccc(CNC(=O)OC(C)(C)C)cc2)=N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.