3-Hydroxyxanthen-9-one
2-(3,4,5-Trimethoxyphenyl)-1H-pyrrolo[2,3-b]pyridin-4-ol
6-Methoxythiazolo[5,4-b]pyridine-2(1H)-thione
1H-Pyrrolo[2,3-d]pyrimidine-2,4(3H,5H)-dione
2-Amino-7H-pyrrolo[2,3-d]pyrimidin-4-ol
2-(3,4-Dihydroxyphenyl)-3,5,7-trihydroxychromenylium
Pteridine-2,4-diol
