Using O=C(O)CC(=O)O, CC1CCC(C(C)C)C(O)C1 to produce CC1CCC(C(C)C)C(OC(=O)CC(=O)OC2CC(C)CCC2C(C)C)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.