Using CCOC(=O)CCCOc1cccc(C(O)CCNC(=O)OC(C)(C)C)c1 to produce CC(C)(C)OC(=O)NCCC(O)c1cccc(OCCCC(=O)O)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.