when various melatonin analogues were tested for their ability to inhibit ( 3h ) -melatonin binding , the following ki values ( 10 ( -7 ) m ) , were obtained : n-acetyl-serotonin 120 , serotonin 130 , 2-methyl indole 154 , 5-hydroxytryptophol 218 , 5-methoxytryptamine 266 , 5-methoxytryptophol 660 , tryptamine 1,740 , 5-hydroxyindole acetic acid 3,455 , 5-methoxyindole acetic acid 12,690 , 5-hydroxytryptophan 13,600 , and 6-hydroxymelatonin 55,550 .
C0036751
serotonin
C0000589
5-methoxytryptamine