What is the chemical makeup of melatonin?

Melatonin is a hormone primarily produced by the pineal gland in the brain. Its chemical formula is C13H16N2O2, which indicates it consists of 13 carbon (C) atoms, 16 hydrogen (H) atoms, 2 nitrogen (N) atoms, and 2 oxygen (O) atoms. The structure includes an indole ring and an acetamide side chain, contributing to its biological function in regulating sleep-wake cycles.