Using CCOC(=O)C(=Cc1ccc(OCCN2COc3ccccc3C2=O)cc1)OCC to produce CCOC(=O)C(Cc1ccc(OCCN2COc3ccccc3C2=O)cc1)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.