4,9-Dihydroxy-9-(4-hydroxy-4,5-dimethyl-3-oxo-2-oxabicyclo[3.2.1]oct-6-yl)-9a,11b-dimethyl-5a,6,6a,6b,7,8,9,9a,10,11,11a,11b-dodecahydrocyclopenta[1,2]phenanthro[8a,9-b]oxiren-1(4H)-one AIDS-141724 AIDS141724 Acnistin F NSC657923