2-amino-6-(1,2-dihydroxypropyl)-6,7-dihydro-1H-pteridin-4-one (6R)-2-amino-6-[(1R,2S)-1,2-dihydroxypropyl]-6,7-dihydro-1H-pteridin-4-one CHEBI:20680 q-dihydrobiopterin 2-amino-6-(1,2-dihydroxypropyl)-7,8-dihydropteridin-4(6H)-one