(3S,7R,9S,10S,13R,14S,17R)-17-((R)-5-Hydroxypentan-2-yl)-10,13-dimethyl-3-((tetrahydro-2H-pyran-2-yl)oxy)hexadecahydro-1H-cyclopenta[a]phenanthren-7-ol is an intermediate in the synthesis of 5α-Cholesta-7,24-diene-3β-ol (C431505), which is the derivative of Zymosterol (Z701520). It can also be used for identification of a new plasma biomarker of Alzheimer's disease using metabolomics technology.