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Fosnetupitant chloride monohydrochloride (Pro-netupitant chloride monohydrochloride) is a selective NK1 antagonist exhibiting high affinity for the human NK1 receptor with a pK i value of 9.5, and a lower affinity for the NK3 receptor with a pK i of 6.1. It serves as a methylene phosphate prodrug of Netupitant [1].

| Pack Size | Price | Availability | Quantity |
|---|---|---|---|
| 5 mg | Inquiry | 8-10 weeks | |
| 50 mg | Inquiry | 8-10 weeks |
| Description | Fosnetupitant chloride monohydrochloride (Pro-netupitant chloride monohydrochloride) is a selective NK1 antagonist exhibiting high affinity for the human NK1 receptor with a pK i value of 9.5, and a lower affinity for the NK3 receptor with a pK i of 6.1. It serves as a methylene phosphate prodrug of Netupitant [1]. |
| Targets&IC50 | NK1 (human):9.5 (pKi), NK3 (human):6.1 (pKi) |
| In vitro | Fosnetupitant chloride monohydrochloride demonstrates micromolar affinity for 5-HT6 receptors (pKi ∼ 5.2) and L-type Ca2+ channels (pKi > ∼ 5.7), without binding to any other proteins studied [1]. |
| In vivo | Fosnetupitant chloride monohydrochloride (i.v.) quickly metabolizes into Netupitant [1] within minutes. |
| Synonyms | Pronetupitant chloride monohydrochloride |
| Molecular Weight | 761.52 |
| Formula | C31H37Cl2F6N4O5P |
| Cas No. | 1643757-72-5 |
| Storage | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | Shipping with blue ice/Shipping at ambient temperature. |

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