Dyspropterin (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 and sepiapterin reductase.
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