Main Reaction: lanosterol >> brassinolide + sitosterol + campesterol + cholesterol

Reference: PubMed ID: 17917299
Authors: Ohyama K, Suzuki M, Masuda K, Yoshida S, Muranaka T
Title: Chemical phenotypes of the hmg1 and hmg2 mutants of Arabidopsis demonstrate the in-planta role of HMG-CoA reductase in triterpene biosynthesis.
Published: 2007 Oct

lanosterol --> brassinolide + sitosterol + campesterol + cholesterol