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3-bromo-1H-pyrazolo[3,4-b]pyrazine
tert-butyl 5-bromo-3-methyl-1H-pyrazolo[3,4-b]pyrazine-1-carboxylate
3-methyl-1H-pyrazolo[3,4-b]pyrazine
1H-pyrazolo[3,4-b]pyrazine