Structural derivatives of tetracyclic alcohols with a hydroxyl group in the position \(\ce{C-3}\) and an aliphatic side chain in the position \(\ce{C-17}\).
Note: This category primarily comprises sterols: polycyclic compounds of isoprenoid origin and their various derivatives, including steroids, bile acids, and sterol esters. Sterols, along with
glycerophospholipids and
sphingolipids, are important constituents of cellular membranes. In addition, sterol lipids act as hormones (steroids) or fat emulsifiers (bile acids).
Examples: Subclasses are represented by cholesterol, ergosterol, taurocholic acid, glucuronides.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1182 (https://doi.org/10.1515/pac-2016-1120)