Using CCOC(=O)CCOCC(COCCC(=O)OCC)NC(=O)CCNC(=O)OCc1ccccc1 to produce O=C(O)CCOCC(COCCC(=O)O)NC(=O)CCNC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.