5.beta.-Ergosta-2,24-dien-26-oic acid, 5,6.beta.-epoxy-4.beta.,22,27-trihydroxy-1-oxo-, .delta.-lactone, (20S,22R)- 5119-48-2 Ergosta-2,24-dien-26-oic acid, 5,6-epoxy-4,22,27-trihydroxy-1-oxo-, .delta.-lactone, (4.beta.,5.beta.,6.beta.,22R)- NSC273757 WITHAFERIN DERIV JPR, IOWA U. COMPOUND Withaferin A