Progressive familial intrahepatic cholestasis type 3 (PFIC3) is a genetic liver disorder caused by mutations in the ABCB4 gene encoding multidrug resistance protein 3 (MCP3) in humans, a biliary phospholipid transporter. Rectify Pharmaceuticals Inc. has developed the novel compound RTY-694, a dual-acting MDR3/BSEP positive modulator that increased the protein function of both MDR3 and BSEP.