Solabegron (GW-427,353), is a selective agonist of β3 adrenergic receptors. In addition, Solabegron has been shown to produce visceral analgesia by releasing somatostatin from fat cells.
PD-217014 is a GABA analog. It inhibits (3)H-gabapentin binding to alpha(2)delta subunit of voltage-gated calcium channels in a concentration-dependent manner (K(i) = 18 nmol/l). PD-217014 possesses visceral analgesic activity.
Neostibosan is an arsenic-containing parasitic agent. Due to the activity of arsenic on visceral L/Ashmaniasis, one of the pentvalent antimony, which is less toxic, is synthesized and has potential activity on tumor cells.