Using O=Cc1ccccc1, CC(C)OC(=O)CCCC(=O)OC(C)C to produce CC(C)OC(=O)CCC(C(=O)OC(C)C)C(O)c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.