Pyrido[2,3-d]pyrimidine
Pyrimido[4,5-c]pyridazine
Pyrimido[4,5-d]pyrimidine
7H-Pyrano[2,3-d]pyrimidine
5H-Thiopyrano[2,3-d]pyrimidine
Naphthyridine
Pyrido[3,2-d]pyrimidine
Pyrimido[5,4-d]pyrimidine
Pyrido[3,4-b]pyrazine
1,2,4-benzotriazena
1H-2,1,4-Benzothiadiazine
Pyrazino[2,3-d]pyridazine
Pyrazino[2,3-c]pyridazine
Pyrido[2,3-e][1,2,4]triazine
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