157998-91-9 2-Oxabicyclo(3.2.1)octan-3-one, 7-((17beta)-17-hydroxy-1-oxoandrosta-2,4,6-trien-17-yl)-4,4,5-trimethyl-, (1R,5R,7S)- Acnistin B Androsta-2,4,6-trien-1-one, 17-hydroxy-17-(4,4,5-trimethyl-3-oxo-2-oxabicyclo(3.2.1)oct-7-yl)-, (17beta,17(1R,5R,7S))-