Pamoic acid disodium is a potent GPR35 agonist with an EC 50 value of 79 nM. Pamoic acid disodium induces GPR35 internalization and activates ERK1/2 with EC 50 values of 22 nM and 65 nM, respectively. Pamoic acid disodium potently recruits β-arrestin2 to GPR35 and has an antinociceptive effect.