Using CCN(CC)CCCn1nc(N2C(=O)c3ccccc3C2=O)c2c(Cl)cccc21 to produce CCN(CC)CCCn1nc(N)c2c(Cl)cccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.