HPLC(4) linear(4) SARS-CoV-2 patients(3) approved(3) stationary phase(3) stationary(3) Standard deviation(3) tablets(3) stress conditions(3) stability(3) molecular(3) limit(3) LC-MS(3) identification(3) Forced(3) Volume(3) dosage(3) treat(3) Favipiravir(3) temperature(3) country(3) quantification(3) column temperature(3) Analysis(3) supported(3) water(3) Precision(3) injection(3) buffer(3) Research(3)