Using CCN(CC)c1ccc2c(c1)OC(=C1Oc3cc(N(CC)CC)ccc3C1=O)C2=O to produce CCN(CC)c1ccc2c(c1)OC(=C1Oc3ccccc3C1=O)C2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.