TBDMS-(3β)?-3-?[(Tetrahydro-?2H-?pyran-?2-?yl)?oxy]?-chol-?5-?en-?24-?oic Acid 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.