Chemicals
Reference; Favipiravir, was supplied from Kohn&Shawn Pharmatech Co., Ltd.,China., (Batch No: KSY34-22-20200415) and Internal Standard; [13C15N] Favipiravir (IS), was supplied from AlsaChim, (MJ-ALS-20-026-P2), France.
Solvents: Methanol and acetonitrile were supplied from Merck, Germany. Ultrapure (Type 1) Water was supplied from Milipore MilliQ Water Purification System; K2Edta Blank Human Plasma was supplied from Bioivt Laboratories International Ltd, UK.