Fig. 1.

a Favipiravir molecule from molview.org/?cid=492405. The formula is C₅H₄FN₃O₂. The molecular weight is 157.1 µg, hydrogen bond donors 2, hydrogen bond acceptors 4. Percent composition is C 12.0107 µg × 5 38.226%; H 1.00794 µg × 4, 2.5663%; F 18.998404 µg × 1, 12.093%; N 14.0067 µg × 3, 26.747%; and O 15.9994 µg × 2, 20.368%. Systematic name is 5-fluoro-2-oxo-1H-pyrazine-3-carboxamide. b Oseltamivir molecule from molview.org/?cid=65028. The formula is C₁₆H₂₈N₂O₄. The molecular weight is 312.4 µg, hydrogen bond donors 2, hydrogen bond acceptors 5. Percent composition is C 12.0107 µg × 16, 61.514%, H 1.00794 µg × 28, 9.0339%, N 14.0067 µg × 2, 8.9670%, and O 15.9994 µg × 4, 20.485%