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5-Deoxy-L-ribose Phenylhydrazone is an intermediate used in the synthesis of L-Primapterin (P733000), which is a 7-Substituted pterins, a new class of mammalian pteridines. Primapterin, Anapterin, and 6-Oxo-primapterin, three new 7-substituted pterins identified in a patient with hyperphenylalaninemia.