The chemical Sapropterin dihydrochloride has a known molecular formula of C9-H15-N5-O3.2Cl-H. Synonyms may include: Sapropterin hydrochloride, SUN 0588, (6R)-Tetrahydrobiopterin hydrochloride, Kuvan, Sapropterin HCl, UNII-RG277LF5B3, Biopten, BioMarin T 1401, (6beta)-5,6,7,8-Tetrahydro-L-biopterin dihydrochloride, Shiratori SN 0588, 6R-BH4 (ChemID).