Using CCOC(=O)C(=Cc1ccc(OCCn2c(=O)oc3ccccc32)cc1)C(=O)OCC to produce CCOC(=O)C(Cc1ccc(OCCn2c(=O)oc3ccccc32)cc1)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.