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