2-amino-8-ethyl-4,7-dioxo-1H-pteridine-6-carboxylic acid

5-benzylsulfanyl-5-hydroxy-1,3-diazinane-2,4,6-trione

5-hydroxy-5-(2-hydroxy-5-oxocyclopenten-1-yl)-1,3-diazinane-2,4,6-trione

10-[3-(2,4-dioxobenzo[g]pteridin-10-yl)propyl]benzo[g]pteridine-2,4-dione

1H-pyrido[3,2-g]pteridine-2,4-dione