Orally active phosphodiesterase (PDE) 4 inhibitor. Inhibits Th1 cell proliferation and decreases production of IFN-γ, TNF-α, IL-10 and iNOS in vitro. Triggers ovulation and exhibits efficacy against experimental autoimmune encephalomyelitis and murine colitis in vivo. Purity 98%. MW (observed): 265.31