Using CC(=O)CCC1C(C)CCCC1(C)C, CCOC(=O)C(=O)OCC to produce CCOC(=O)C(=O)CC(=O)CCC1C(C)CCCC1(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.