GS-441524

• CAT Number: I017264
• CAS Number: 1191237-69-0
• Molecular Formula: C₁₂H₁₃N₅O₄
• Molecular Weight: 291.26
• Purity: ≥95%

GS-441524, predominant metabolite of Remdesivir and superior to Remdesivir against Covid-19 , shows comparable efficacy in cell-based models of primary human lung and cat cells infected with coronavirus. GS-441524 could strongly inhibits feline infectious peritonitis virus (FIPV), with an EC50 of 0.78 μM[1][2][3].The cells appear and grow normally at all concentrations of GS-441524 and fail to uptake the fluorescent dye CellTox Green at 24 h. The cytotoxic concentration-50% (CC50) is therefore>100 μM. The effective concentration-50% (EC50) of GS-441524 is calculated to be 0.78 μM[1].All 10 treated cats have a rapid response to treatment and lymphocyte levels and rectal temperatures return to pre-infection levels and levels of the two asymptomatic cats. All ten of the once or twice treated cats have remained normal to date (more than eight months post infection). Injections cause a transient "stinging" reaction in some cats within 10 s of compound administration. Localized and transient pain is evidenced by unusual posturing, licking at the injection site and/or vocalizations that last for approximately 30-60 s after injection. Injection reactions are more pronounced in some animals relative to others and reactions are inconsistent from one injection to the next and decreas over time[1].
Remdesivi (IV injection) in NHP results in GS-441524 being present in serum at concentrations 1000-fold higher than Remdesivir throughout a 7-day treatment course[3].

Reference

[1]. Murphy BG, et al. The nucleoside analog GS-441524 strongly inhibits feline infectious peritonitis (FIP) virus in tissue culture and experimental cat infection studies. Vet Microbiol. 2018 Jun;219:226-233.[2]. Katherine Yang, et al. What Do We Know About Remdesivir Drug Interactions? Clin Transl Sci. 2020 May 13;10.1111/cts.12815.[3]. Victoria C. Yan, et al. Advantages of the Parent Nucleoside GS-441524 over Remdesivir for Covid-19 Treatment. ACS Med. Chem. Lett. 2020.