a variety of other indole derivatives such as d-tryptophan , 5-hydroxyl-l-tryptophan , tryptamine , serotonin , melatonin , n-acetyl-l-tryptophan , n-acetyl-l-tryptophanamide , 3-indoleacetamide , 3-indolelactic acid , 3-indolepropionic acid , 3-indoleethanol , and skatole were also substrates .
C0000578
5-hydroxyl
C0041249
tryptophan