Using O=C1OC(=O)c2ccccc21, CCCCCCC(C(=O)OCC)c1ccccc1 to produce CCCCCCC(C(=O)O)c1ccc(C(=O)c2ccccc2C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.