GSK-J2 sodium, the sodium form of GSK-J2, is an isomer of GSK-J1 and lacks specific activity. GSK-J1 is a potent inhibitor of H3K27me3 me2-demethylases JMJD3 KDM6B and UTX KDM6A [1].
GSK J5 HCl is the hydrochloride form of GSK J5. GSK J5 is an inactive isomer of GSK J4 and a cell-permeable ester derivative of inactive control GSKJ2.