How is (7R,8R,9S,13S,14S,17S)-13-Methyl-7-(9-((4,4,5,5,5-pentafluoropentyl)thio)nonyl)-7,8,9,11,12,13,14,15,16,17-decahydro-6h-cyclopenta[a]phenanthrene-3,17-diol (CAS: 153004-31-0) typically synthesized?

This compound is typically synthesized via a multistep process involving the protection of key functional groups, introduction of the pentafluoropentyl thioether, and subsequent ring-opening reactions. The synthesis often employs catalytic hydrogenation and use of protecting agents to ensure the desired stereochemistry. High yields and good selectivity are achieved with optimized conditions and careful control of reaction parameters.