| Member | Definition | Role |
|---|
| 6-hydroxymethyl-7,8-dihydropterin | A dihydropterin that is 7,8-dihydropteridin-4-ol substituted at positions 2 and 6 by amino and hydroxymethyl groups respectively. | 2-amino-6-(hydroxymethyl)-7,8-dihydropteridin-4-ol; 2-amino-6-(hydroxymethyl)-7,8-dihydropteridin-4-one |
| 6-hydroxymethyl-7,8-dihydropterin | A dihydropterin that is 7,8-dihydropteridin-4-one substituted at positions 2 and 6 by amino and hydroxymethyl groups respectively. | 2-amino-6-(hydroxymethyl)-7,8-dihydropteridin-4-ol; 2-amino-6-(hydroxymethyl)-7,8-dihydropteridin-4-one |
| 7,8-dihydroneopterin | A neopterin where positions C-7 and C-8 have been hydrogenated. | 7,8-dihydroneopterin |
| dihydroneopterin triphosphate | | 7,8-dihydroneopterin 3'-triphosphate |