tryptophan metabolites ( mg/kg ) : dl-5-hydroxytryptophan ( 5-htp , 6 and 12 ) , tryptamine ( 2.5 and 5 ) , 1-4 and dl- ( 2 and 6 ) kynurenine , as well as drugs modifying tryptophan metabolism , such as ro-4-4602 ( 2 ) , an inhibitor of peripheral decarboxylase of aromatic amino acids , and allopurinol ( 2 ) , an inhibitor of tryptophan pyrrolase ( 10 and 17 ) , enhanced alcohol intake .
C0041249
tryptophan
C0000578
5-htp