5-METHOXYTRYPTAMINE-ALPHA,ALPHA,BETA,BETA-D4;5-MethoxytryptaMine-a,a,,-d4;5-Methoxytryptamine-α,α,β,β-d4;1,1,2,2-tetradeuterio-2-(5-methoxy-1H-indol-3-yl)ethanamine;Melatonin EP Impurity C-d4 (Melatonin USP Related Compound A-d4);Melatonin EP Impurity C-d4