Necrostatin-34 (2-{[3-cyano-4-(4-methylphenyl)-6-oxo-1,4) is a RIPK1 kinase inhibitor, stabilizing RIPK1 kinase in an inactive conformation by occupying a distinct binding pocket in the kinase domain.

Necrostatin-34 (10?μM) inhibits the dimerization-induced RIPK1 activation as examined by phosphorylation of Ser166 (p-S166) of RIPK1, a biomarker for RIPK1 activation. Necrostatin-34 may block TNFα-induced complex II formation by inhibiting the activation of RIPK1 kinase. Necrostatin-34 shows IC50 values of 667 nM and 134 nM for TNFα in FADD def-Jurkat cells and L939 cells, respectively.