Intermediats of Favipiravir

Intermediats of Favipiravir are available, CAS# are as follows

259793-88-9 6-Bromo-3-hydroxypyrazine-2-carboxamide
356783-16-9 3,6-Dichloro-2-pyrazinecarbonitrile
356783-28-3 3,6-Difluoro-2-pyrazinecarbonitrile
356783-31-8 6-Fluoro-3-oxo-3,4-dihydro-2-pyrazinecarbonitrile

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