pyrimido[5,4-e][1,2,4]triazine
Pyrimido[4,5-e]-1,2,4-triazine
2H-1,4-Benzoxazine
5H-Pyrimido[4,5-b][1,4]oxazine
7H-Pyrimido[4,5-b][1,4]oxazine
2H-1,4-benzotiazina
2H-1,2,4-Benzothiadiazine
pyrano[3,2-b]pyran
1,4-benzodioxine
1,4-Benzoxathiin
1,4-Benzodithiin
Pirazino[2,3-b]pirazina
[1,4]dioxino[2,3-b][1,4]dioxina
1,4-Dithiino[2,3-b]-1,4-dithiin
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