d-Epigalbacin is a naturally occurring lignin. d-Epigalbacin is a potent, selective JNKs inhibitor, with IC50s of 1.7 μM, 2.9 μM and 1.74 μM for JNK1, JNK2 and JNK3, respectively.
(−)-zuonin A binds the D-recruitment site of JNK. (−)-zuonin A inhibits the activation and phosphorylation of JNK by MKK4 and MKK7[1].