35818-62-3 4(1H)-Pteridinone, 2-amino-7-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydro- 7-(1,2-Dihydroxypropyl)-5,6,7,8-tetrahydrobiopterin 7-(erythro-1,2-Dihydroxypropyl)-5,6,7,8-tetrahydrobiopterin 7-Thbp H4-7-Biopterin Tetrahydro-7-biopterin