Melatonin, 5-methoxy-N-acetyltryptamine, is a hormone found in all living creatures from algae^[1] to humans, at levels that vary in a daily cycle.Melatonin has a chemical formula of C₁₃H₁₆N₂O₂  ^{and a molecular mass of 232.278 g/mol.} It plays a role in the regulation of the circadian rhythm of several biological functions. For more information click here.

	To Rotate Molecule -->> Left Click and Drag To Zoom-->> Left Click + hold left mouse button and Drag Jsmol Menu --->> Right-Click To view the Melatonin Molecule in Chime 3D