(1R,2S)-(2-Amino-3,4,5,6,7,8-hexahydro-4-oxo-6-pteridinyl)-1,2-propandiol 17528-72-2 4(1H)-Pteridinone, 5,6,7,8-tetrahydro-2-amino-6-(1,2-dihydroxypropyl)- 5,6,7,8-Tetrahydro-2-amino-6-(1,2-dihydroxypropyl)-4(1H)-pteridinone 5,6,7,8-Tetrahydrobiopterin 5-26-18-00418 (Beilstein Handbook Reference) BH4 BRN 0544742 L-erythro-2-Amino-6-(1,2-dihydroxypropyl)-5,6,7,8-tetrahydro-4(3H)-pteridinon Tetrahydrobiopterin