Favipiravir, also known as T-705 or Avigan, is an experimental antiviral drug being developed by Toyama Chemical of Japan with activity against many RNA viruses. Like some other experimental antiviral drugs (T-1105 and T-1106), it is a pyrazinecarboxamide derivative. Favipiravir is active against influenza viruses, West Nile virus, yellow fever virus, foot-and-mouth disease virus as well as other flaviviruses, arenaviruses, bunyaviruses and alphaviruses. Activity against enteroviruses and Rift Valley fever virus has also been demonstrated.

CAS：259793-96-9
中文别名：6-氟-3,4-二氢-3-氧代-吡嗪羧酰胺;2-羟基-3-甲酰胺基-5-氟吡嗪;
英文别名：6-FLUORO-3-HYDROXYPYRAZINE-2-CARBOXAMIDE;6-fluoro-3-hydroxypyrazine-2-carboxaMide;2-Pyrazinecarboxamide,6-fluoro-3-hydroxy;UNII-EW5GL2X7E0;6-fluoro-3-oxo-3,4-dihydropyrazine-2-carboxamide;6-fluoro-3-hydroxy-2-pyrazinecarboxamide;T-705;Favipiravir;
分子式：C5H4FN3O2
分子量：157.103
精确质量：157.029
Psa：88.84
Logp：-0.2918

密度：1.78 g/cm3
沸点：552.6ºC at 760 mmHg

海关编码：2934999090