Abstract: The biosynthesis of 19-norstanols in the Mediterranean sponge, Axinella polypoides, was investigated through the use of radiotracer experiments. It was found that the conversion of cholesterol (7) to 19-nor-5a-cholestan-3~-ol (8) involved oxidation at C-3 with the distribution of the abstracted hydride from the 3a-position of dietary cholesterol into all of the 19-norstanols of the native mixture. Furthermore, while the efficiency of ...
![tert-butyl(((6R)-6-((1aR,3aR,3bS,5aR,6R,8aS,8bS,10R,10aR)-10-methoxy-3a,5a-dimethylhexadecahydrocyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-2-methylheptyl)oxy)diphenylsilane结构式](https://image.chemsrc.com/caspic/196/137435-78-0.png)
