Pemigatinib-d 6 (INCB054828-d 6 ) is deuterium labeled Pemigatinib. Pemigatinib (INCB054828) is an orally active, selective FGFR inhibitor with IC 50 s of 0.4 nM, 0.5 nM, 1.2 nM, 30 nM for FGFR1 , FGFR2 , FGFR3 , FGFR4 , respectively. Pemigatinib has the potential for cholangiocarcinoma.