in the brain of rats injected with pentoxifylline [ 3,7-dimethyl-1 ( 5-oxo-hexyl ) -xanthine ] or aminophylline the following was observed : ( i ) dose-dependent increases of tryptophan and 5-hydroxyindoleacetic acid levels and of 5-hydroxytryptophan and dihydroxyphenylalanine accumulation after treatment with the decarboxylase inhibitor benserazide hcl ;
C0041249
tryptophan
C0000578
hydroxytryptophan