Occurs along with β-sitosterol and stigmasterol. Formation from β-sitosterol: Bernstein, Wallis, J. Org. Chem. 2, 341 (1937); from β-sitostenone: Marker, Wittle, J. Am. Chem. Soc. 59, 2704 (1937). Antihypercholesteremic activity in rabbits: I. Ikeda et al., J. Nutr. Sci. Vitaminol. 27, 243 (1981).