Using CCOC(=O)C(=O)NC(=O)OC(C)(C)C, COC(=O)C1CC2CC(O)C1C2 to produce CCOC(=O)C(=O)N(C(=O)OC(C)(C)C)C1CC2CC(C(=O)OC)C1C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.