This is a salt, commonly used in organic synthesis. The tetraphenylphosphonium cation is often employed as a stable counterion for various anionic species. Tetrafluoroborate is a common anion used in such salts.
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1,1,4a-trimethyl-1,2,3,4,4a,9,10,10a-octahydrophenanthren-2β-ol
