Broad spectrum neuropeptide inverse agonist and antagonist. Potent full inverse agonist for the ghrelin receptor (EC50 = 5.2 nM); diminishes constitutive ghrelin receptor signaling. Also antagonist at tachykinin, bradykinin, CCK and bombesin receptors. Induces apoptosis and inhibits cancer cell growth in vitro.

IQ3 is a selective inhibitor of JNK3(JNK3, JNK1 and JNK2 with Kd of 66 nM, 240 nM and 290 nM, respectively).

SP600125 is a potent, selective, reversible, ATP-competitive inhibitor of JNK with IC50 of 40, 40 and 90 nM for JNK1, JNK2 and JNK3, respectively.