Using COC(=O)CC(=O)CC(O)(CCNC(=O)OC(C)(C)C)C1CCCC1 to produce CC(C)(C)OC(=O)NCCC1(C2CCCC2)CC(=O)CC(=O)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.