other indole compounds such as 5-methoxytryptophol , 5-hydroxytryptophol , 6-hydroxymelatonin , n-acetylserotonin , 5-methoxytryptamine and serotonin were also inhibitory although their effects were less than 1/10,000 that of melatonin .
C0000589
5-methoxytryptamine
C0036751
serotonin