IL-6-IN-2 (Compound 15) is an inhibitor of the IL-6/IL-6R protein interaction. The ∆G binding energy of IL-6-IN-2 is −36.50 kcal/mol. Contributions of Lys66, Phe74, Gln175, Ser176, and Arg179 to IL-6 binding are −1.10, −8.68, −6.91, −3.69, and −1.72 kcal/mol, respectively. IL-6-IN-2 exhibits low gastrointestinal (GI) absorption[1].