File:4a-Hydroxytetrahydrobiopterin.svg
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![File:4a-Hydroxytetrahydrobiopterin.svg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d5/4a-Hydroxytetrahydrobiopterin.svg/346px-4a-Hydroxytetrahydrobiopterin.svg.png?20070701212545)
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