title: Lumisterol
text: # Lumisterol
  
  Lumisterol is a compound that is part of the vitamin D family of steroid compounds. It is the (9β,10α) stereoisomer of ergosterol and was produced as a photochemical by-product in the preparation of vitamin $D_1,$ which was a mixture of vitamin $D_2$ and lumisterol. Vitamin $D_2$ can be formed from lumisterol by an electrocyclic ring opening and subsequent sigmatropic [1,7] hydride shift.
  
  Lumisterol has an analog based on 7-dehydrocholesterol, known as lumisterol 3.
  
  