2-AZETIDINONE, 1-(20-alpha-(DIMETHYLAMINO)-4-OXO-5-alpha-PREGNAN-3-beta-YL)-3-IS 2-Azetidinone, 1-(20-alpha-(dimethylamino)-4-oxo-5-alpha-pregnan-3-beta-yl)-3-isopropyl-, (3R)- 6156-99-6 Pachystermine A