(R)-Bromoenol lactone-d 7 ((R,E)-Bromoenol lactone-d 7 ) is deuterium labeled (R)-Bromoenol lactone. (R)-Bromoenol lactone ((R)-BEL) is an irreversible, chiral, mechanism-based inhibitor of calcium-independent phospholipase γ (iPLA2γ). (R)-BEL inhibits human recombinant iPLA2γ with an IC 50 of approximately 0.6 μM.