Apremilast D5 (CC-10004 D5) is a deuterium-labeled Apremilast. Apremilast is an orally available inhibitor of PDE-4 (IC50: 74 nM). Apremilast inhibits TNF-α release by lipopolysaccharide (IC50: 104 nM).
(Rac)-Apremilast D5 is a deuterium-labeled version of the enantiomer (R)-Apremilast, also known as (R)-CC-10004, which itself is one specific form of Apremilast.