Using CC(=O)OC(C)=O, COC1(OC)CCC(C(=O)OC(C)(C)C)(C(C)O)C1 to produce COC1(OC)CCC(C(=O)OC(C)(C)C)(C(C)OC(C)=O)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.