Dyspropterin

Dyspropterin, or 6-pyruvoyltetrahydropterin (6-PTHB), is an intermediate in tetrahydrobiopterin biosynthesis.

It is the product of the enzyme 6-pyruvoyltetrahydropterin_synthase and the substrate of two enzymes 6-pyruvoyltetrahydropterin_2'-reductase, Sepiapterin_reductase