Which of the following is not a derivative of cholesterol?

Vitamin $\mathrm{E}$ is a collective name for all stereoisomers of tocopherols and tocotrienols. The most biologically active form is $\alpha$-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.