https://doi.org/10.1351/goldbook.09861
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.