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L-Biopterin Cayman Chemical Item Number 10007662 Description L-Biopterin is the oxidized form of tetrahydro-L-biopterin (BH4), a nitric oxide synthase (NOS) cofactor. L-Biopterin can be reduced to BH4 via thioredoxin reductase followed by dihydropteridine reductase or reduced glutathione. It is extremely toxic to human melanocytes in culture (IC50 = 0.2 µM after 48 hrs).1↗ L-Biopterin is rarely found under physiological conditions except in the epidermis of patients with the depigmentation disorder Vitiligo.2↗ Synonyms L-erythro-Biopterin NSC 339699 Formal Name 2-amino-6-[(1R,2S)-1,2-dihydroxypropyl]-4(1H)-pteridinone CAS Number 22150-76-1 Molecular Formula C9H11N5O3 Formula Weight 237.2 Formulation A crystalline solid Purity >98% λmax 276, 348 nm Stability 2 years Storage -20°C Shipping Room temperature in continental US; may vary elsewhere SMILES NC(N=C1C2=NC([C@@H](O)[C@@H](O)C)=CN1[H])=NC2=O InCHI Code 1S/C9H11N5O3/c1-3(15)6(16)4-2-11-7-5(12-4)8(17)14-9(10)13-7/h2-3,6,15-16H,1H3,(H3,10,11,13,14,17)/t3-,6-/m0/s1 InCHI Key LHQIJBMDNUYRAM-DZSWIPIPSA-N |