RO2959 monohydrochloride is a potent and selective CRAC channel inhibitor with an IC 50 of 402 nM. RO2959 monohydrochloride is a potent blocker of store operated calcium entry (SOCE) mediated by Orai1/Stim1 channels with an IC 50 of 25 nM. RO2959 monohydrochloride is also a potent inhibitor of human IL-2 production, and potently blocks T cell receptor triggered gene expression and T cell functional pathways In Vitro RO2959 inhibits Orai1 and Orai3 with IC 50 values of 25 nM and 530 nM, respectively. RO2959 blocks store operated calcium entry (SOCE) in activated CD4+T lymphocytes with an IC 50 value of 265 nM. RO2959 is a potent SOCE inhibitor that blocks an IP3-dependent current in CRAC-expressing RBL-2H3 cells and CHO cells stably expressing human Orai1 and Stim1, as well as SOCE in human primary CD4 + T cells triggered by either T cell receptor (TCR) stimulation or thapsigargin treatment. RO2959 completely inhibits cytokine production as well as T cell proliferation mediated by TCR stimulation or MLR (mixed lymphocyte reaction). MCE has not independently confirmed the accuracy of these methods. They are for reference only. Form:Solid IC50& Target:CRAC channel 402 nM (IC 50 ) Orai1/Stim1 channels 25 nM (IC 50 ) IL-2