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| Systems | Ligand | Charge in C4 group (zanamivir numbering) of inhibitor | Protonation state of H150 |
|---|---|---|---|
| OST-NH3-H150-Pos* | Oseltamivir carboxylate | Positive | Positive |
| OST-NH2-H150-Pos | Oseltamivir carboxylate | Neutral | Positive |
| OST-NH2-H150-Neu | Oseltamivir carboxylate | Neutral | Neutral |
| FREE-H150-Neu | - | - | Neutral |
| ZMR-H150-Pos** | Zanamivir | Positive | Positive |
*OST refers to oseltamivir carboxylate.
**ZMR refers to zanamivir.
