00775001_00800000/798480 AIDS-160163 AIDS160163 NSC266494 Picras-3-ene-2,16-dione, 13,20-epoxy-1,11,12-trihydroxy-15-( 2-methyl-1-oxobutoxy)-, (1.beta.,11.beta.,12.alpha.,15.beta.)- Similikalactone D