IPBT-5CA (306935-41-1) is a highly selective agonist for the human orphan G-protein-coupled receptor GPR109b (EC50 = 400 nM). No activity was reported at the highly homologous high-affinity niacin receptor GPR109a.
1) Semple et al. (2006) 1-Alkyl-benzotriazole-5-carboxylic acids are highly selective agonists of the human orphan G-protein-coupled receptor GPR109b; J. Med. Chem., 49 1227