IW927 is a potent small molecule antagonist that blocks the binding of TNF-α to TNFRc1 with an IC50 value of 50 nM and disrupts TNFα-induced IκB phosphorylation with an IC50 value of 600 nM[1].
[1]. Percy H. Carter, et al. Photochemically enhanced binding of small molecules to the tumor necrosis factor receptor-1 inhibits the binding of TNF-alpha. Proc Natl Acad Sci U S A. 2001 Oct 9;98(21):11879-84.