Which of the following is not a derivative of cholesterol?

Step-by-step solution

Vitamin E is a collective name for all stereoisomers of tocopherols and tocotrienols. The most biologically active form is -tocopherol. Vitamin E acts as a chain breaking antioxidant and is an efficient free radical scavenger to protect low density lipoproteins (LDLs) and polyunsaturated fats in membranes from oxidation.