N-[2-[5-(Acetyloxy)-1H-indol-3-yl]ethyl]acetamide-D6 is an intermediate used in the synthesis of N-Acetyl-d3-5-hydroxytryptamine (A179162), which is deuterium labelled N-Acetyl-5-hydroxytryptamine (A179160), which is a metabolite of Melatonin (M215000).