Using O=C1CCN(c2ccc(Cl)c(-c3nc4ccccc4[nH]3)c2)CC1 to produce OC1CCN(c2ccc(Cl)c(-c3nc4ccccc4[nH]3)c2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.