2-2'-(Hydroxytetracosanoylamino)-octadecane-1,3,4-triol tetraacetate at concentration of 100 ug/mL shows selectively inhibitory activity against phospholipase A 2 (PLA 2) secreted from Crotalus adamenteus venom, but inactive against PLA 2 of bee venom (Apis mellifcra).