Nonoxidative cyclization of squalene by Tetrahymena pyriformis. The incorporation of a 3β-hydrogen (deuterium) atom into tetrahymanol

Abstract
It was shown by 2H-n.m.r. spectroscopy that the proton introduced by T. pyriformis in the cyclization of squalene assumes the 3β-stereochemistry in the biosynthesized tetrahymanol.