4-Azabenzimidazole
5H-Purine
6H-Purine
8H-Purine
1H-1,2,3-triazolo(4,5-B)pyridine
7H-1,2,3-Triazolo[4,5-d]pyrimidine
5H-1,2,3-Triazolo[4,5-d]pyrimidine
2H-1,2,3-Triazolo[4,5-d]pyrimidine
2H-[1,2,3]triazolo[4,5-d]pyrimidine
7aH-[1,3,2]diazaphospholo[4,5-d]pyrimidin
[1,2,5]Thiadiazolo[3,4-d]pyrimidine(8CI,9CI)
[1,2,5]Selenadiazolo[3,4-d]pyrimidine(7CI,8CI,9CI)
Benzoxazole
Oxazolo[4,5-c]pyridine
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