This enzyme belongs to the family of isomerases, specifically those intramolecular oxidoreductases transposing C=C bonds. The systematic name of this enzyme class is Delta7-cholestenol Delta7-Delta8-isomerase. This enzyme participates in biosynthesis of steroids.
Wilton DC, Rahimtula AD, Akhtar M (1969). "The reversibility of the delta8-cholestenol-delta7-cholestenol isomerase reaction in cholesterol biosynthesis". Biochem. J.114 (1): 71–3. PMC1184797. PMID5810070.