Laninamivir Octanoate
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MedKoo CAT#: 565049

CAS#: 203120-46-1 (octanoate)

Description: Laninamivir Octanoate, also known as CS-8958, is a long acting neuraminidase inhibitor which shows superior anti-influenza virus activity. Laninamivir octanoate and artificial surfactant combination therapy significantly increases survival of mice infected with lethal influenza H1N1 Virus. A single intranasal administration of CS-8958 showed a superior reduction of virus load in lungs in mouse infection model.


Chemical Structure

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Laninamivir Octanoate
CAS# 203120-46-1 (octanoate)

Theoretical Analysis

MedKoo Cat#: 565049
Name: Laninamivir Octanoate
CAS#: 203120-46-1 (octanoate)
Chemical Formula: C21H36N4O8
Exact Mass: 472.2533
Molecular Weight: 472.54
Elemental Analysis: C, 53.38; H, 7.68; N, 11.86; O, 27.09

Price and Availability

Size Price Availability Quantity
50.0mg USD 1250.0 2 Weeks
100.0mg USD 1950.0 2 Weeks
200.0mg USD 2950.0 2 Weeks
500.0mg USD 4650.0 2 Weeks
1.0g USD 6950.0 2 Weeks
2.0g USD 12950.0 2 Weeks
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Related CAS #: 203120-17-6 (free base)   203120-18-7 (TFA)   203120-46-1 (octanoate)   1233643-88-3 (octanoate hydrate)    

Synonym: Laninamivir Octanoate; CS-8958; CS 8958; CS8958; R-125489; R 125489; R125489;

IUPAC/Chemical Name: (4S,5R,6R)-5-Acetamido-4-guanidino-6-[(1R,2R)- 2-hydroxy-1-methoxy-3-(octanoyloxy)propyl]-5,6-dihydro-4H-pyran-2-carboxylic Acid

InChi Key: UKTIJASCFRNWCB-RMIBSVFLSA-N

InChi Code: InChI=1S/C21H36N4O8/c1-4-5-6-7-8-9-16(28)32-11-14(27)18(31-3)19-17(24-12(2)26)13(25-21(22)23)10-15(33-19)20(29)30/h10,13-14,17-19,27H,4-9,11H2,1-3H3,(H,24,26)(H,29,30)(H4,22,23,25)/t13-,14+,17+,18+,19+/m0/s1

SMILES Code: O=C(C1=C[C@H](NC(N)=N)[C@@H](NC(C)=O)[C@H]([C@H](OC)[C@H](O)COC(CCCCCCC)=O)O1)O

Appearance: Solid powder

Purity: >98% (or refer to the Certificate of Analysis)

Shipping Condition: Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition: Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Solubility: Soluble in DMSO

Shelf Life: >3 years if stored properly

Drug Formulation: This drug may be formulated in DMSO

Stock Solution Storage: 0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 472.54 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

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1: Ogawa T, Tanaka K, Ohgino K, Omori N, Betsuyaku T, Sayama K. Drug-induced pneumonitis following the administration of laninamivir octanoate: The first two reported cases. J Infect Chemother. 2019 Dec;25(12):1043-1046. doi: 10.1016/j.jiac.2019.05.008. Epub 2019 Jun 6. PMID: 31178281.

2: Kawaguchi T, Arinaga-Hino T, Shimizu M, Tanikawa K, Tokushige T, Hirai S, Nagamatsu H, Tateishi H, Takata A, Ide T, Torimura T. Immune-mediated Drug- induced Liver Injury Caused by Laninamivir Octanoate Hydrate. Intern Med. 2019 Sep 1;58(17):2501-2505. doi: 10.2169/internalmedicine.2740-19. Epub 2019 May 22. PMID: 31118398; PMCID: PMC6761336.

3: Tomozawa T, Hoshino K, Yamashita M, Kubo S. Efficacy of laninamivir octanoate in mice with advanced inflammation stage caused by infection of highly lethal influenza virus. J Infect Chemother. 2019 Aug;25(8):584-588. doi: 10.1016/j.jiac.2019.02.023. Epub 2019 Mar 29. PMID: 30935767.

4: Ikematsu H, Kawai N, Iwaki N, Kashiwagi S, Ishikawa Y, Yamaguchi H, Shiosakai K. Duration of fever and other symptoms after the inhalation of laninamivir octanoate hydrate in the 2016/17 Japanese influenza season; comparison with the 2011/12 to 2015/16 seasons. J Infect Chemother. 2018 Sep;24(9):718-724. doi: 10.1016/j.jiac.2018.04.013. Epub 2018 Jun 1. PMID: 29861186.

5: Murasaka T, Ikemura K, Enokiya T, Muraki Y, Ikemura M, Terada K, Iwamoto T, Okuda M. Impact of the number of repeated inhalations and patient characteristics on the residual amount of inhaled laninamivir octanoate hydrate dry powder in pediatric patients with influenza. J Pharm Health Care Sci. 2017 Nov 8;3:26. doi: 10.1186/s40780-017-0094-7. PMID: 29152321; PMCID: PMC5678805.

6: Toyama K, Furuie H, Ishizuka H. Intrapulmonary Pharmacokinetics of Laninamivir, a Neuraminidase Inhibitor, after a Single Nebulized Administration of Laninamivir Octanoate in Healthy Japanese Subjects. Antimicrob Agents Chemother. 2017 Dec 21;62(1):e01722-17. doi: 10.1128/AAC.01722-17. PMID: 29061751; PMCID: PMC5740362.

7: Higashiguchi M, Matsumoto T, Fujii T. A meta-analysis of laninamivir octanoate for treatment and prophylaxis of influenza. Antivir Ther. 2018;23(2):157-165. doi: 10.3851/IMP3189. PMID: 28869418.

8: Ikematsu H, Kawai N, Iwaki N, Kashiwagi S. Duration of fever and other symptoms after the inhalation of laninamivir octanoate hydrate; comparison of the 2011/12 to 2015/16 Japanese influenza seasons. J Infect Chemother. 2017 Sep;23(9):627-633. doi: 10.1016/j.jiac.2017.06.008. Epub 2017 Jul 11. PMID: 28709902.

9: Nakano T, Ishiwada N, Sumitani T, Uemori M, Isobe K; Laninamivir Prophylaxis Study Group. Inhaled Laninamivir Octanoate as Prophylaxis for Influenza in Children. Pediatrics. 2016 Dec;138(6):e20160109. doi: 10.1542/peds.2016-0109. Epub 2016 Nov 2. PMID: 27940664.

10: Ikematsu H, Kawai N, Iwaki N, Kashiwagi S. Duration of fever and other symptoms after the inhalation of laninamivir octanoate hydrate for influenza treatment; comparison among the four Japanese influenza seasons from 2011-2012 to 2014-2015. J Infect Chemother. 2016 Sep;22(9):605-10. doi: 10.1016/j.jiac.2016.06.003. Epub 2016 Aug 1. PMID: 27493024.

11: Kashiwagi S, Watanabe A, Ikematsu H, Uemori M, Awamura S; Laninamivir Prophylaxis Study Group. Long-acting Neuraminidase Inhibitor Laninamivir Octanoate as Post-exposure Prophylaxis for Influenza. Clin Infect Dis. 2016 Aug 1;63(3):330-7. doi: 10.1093/cid/ciw255. Epub 2016 Apr 26. PMID: 27118785; PMCID: PMC4946013.

12: Ikematsu H, Kawai N, Iwaki N, Kashiwagi S. Clinical outcome of laninamivir octanoate hydrate for influenza in the 2013-2014 Japanese season. J Infect Chemother. 2015 Nov;21(11):802-7. doi: 10.1016/j.jiac.2015.08.013. Epub 2015 Sep 26. PMID: 26410550.

13: Koyama K, Ogura Y, Nakai D, Watanabe M, Munemasa T, Oofune Y, Kubota K, Shinagawa A, Izumi T. Identification of bioactivating enzymes involved in the hydrolysis of laninamivir octanoate, a long-acting neuraminidase inhibitor, in human pulmonary tissue. Drug Metab Dispos. 2014 Jun;42(6):1031-8. doi: 10.1124/dmd.114.057620. Epub 2014 Mar 28. PMID: 24682756.

14: Ikematsu H, Kawai N, Iwaki N, Kashiwagi S. The duration of fever and other symptoms after the initiation of laninamivir octanoate hydrate in the Japanese 2011-2012 influenza season. J Infect Chemother. 2014 Feb;20(2):81-5. doi: 10.1016/j.jiac.2013.07.013. Epub 2013 Dec 11. PMID: 24486167.

15: Kakuta M, Kubo S, Tanaka M, Tobiume S, Tomozawa T, Yamashita M. Efficacy of a single intravenous administration of laninamivir (an active metabolite of laninamivir octanoate) in an influenza virus infection mouse model. Antiviral Res. 2013 Oct;100(1):190-5. doi: 10.1016/j.antiviral.2013.08.004. Epub 2013 Aug 15. PMID: 23954190.

16: Koseki N, Kaiho M, Kikuta H, Oba K, Togashi T, Ariga T, Ishiguro N. Comparison of the clinical effectiveness of zanamivir and laninamivir octanoate for children with influenza A(H3N2) and B in the 2011-2012 season. Influenza Other Respir Viruses. 2014 Mar;8(2):151-8. doi: 10.1111/irv.12147. Epub 2013 Aug 19. PMID: 23953886; PMCID: PMC4186462.

17: Kashiwagi S, Watanabe A, Ikematsu H, Awamura S, Okamoto T, Uemori M, Ishida K. Laninamivir octanoate for post-exposure prophylaxis of influenza in household contacts: a randomized double blind placebo controlled trial. J Infect Chemother. 2013 Aug;19(4):740-9. doi: 10.1007/s10156-013-0622-9. Epub 2013 Jun 4. PMID: 23732307; PMCID: PMC3738841.

18: Yoshihara K, Ishizuka H, Kubo Y. Population pharmacokinetics of laninamivir and its prodrug laninamivir octanoate in healthy subjects and in adult and pediatric patients with influenza virus infection. Drug Metab Pharmacokinet. 2013;28(5):416-26. doi: 10.2133/dmpk.dmpk-12-rg-115. Epub 2013 Apr 9. PMID: 23574886.

19: Nakano T, Okumura A, Tanabe T, Niwa S, Fukushima M, Yonemochi R, Eda H, Tsutsumi H. Safety evaluation of laninamivir octanoate hydrate through analysis of adverse events reported during early post-marketing phase vigilance. Scand J Infect Dis. 2013 Jun;45(6):469-77. doi: 10.3109/00365548.2012.763104. Epub 2013 Feb 4. PMID: 23373850.

20: Koyama K, Nakai D, Takahashi M, Nakai N, Kobayashi N, Imai T, Izumi T. Pharmacokinetic mechanism involved in the prolonged high retention of laninamivir in mouse respiratory tissues after intranasal administration of its prodrug laninamivir octanoate. Drug Metab Dispos. 2013 Jan;41(1):180-7. doi: 10.1124/dmd.112.048280. Epub 2012 Oct 22. PMID: 23091189.

21: Kashiwagi S, Yoshida S, Yamaguchi H, Mitsui N, Tanigawa M, Shiosakai K, Yamanouchi N, Shiozawa T, Yamaguchi F. Clinical efficacy of long-acting neuraminidase inhibitor laninamivir octanoate hydrate in postmarketing surveillance. J Infect Chemother. 2013 Apr;19(2):223-32. doi: 10.1007/s10156-012-0481-9. Epub 2012 Oct 20. PMID: 23085742.

22: Fukushi M, Yamashita M, Miyoshi-Akiyama T, Kubo S, Yamamoto K, Kudo K. Laninamivir octanoate and artificial surfactant combination therapy significantly increases survival of mice infected with lethal influenza H1N1 Virus. PLoS One. 2012;7(8):e42419. doi: 10.1371/journal.pone.0042419. Epub 2012 Aug 1. PMID: 22879974; PMCID: PMC3409853.

23: Kashiwagi S, Yoshida S, Yamaguchi H, Niwa S, Mitsui N, Tanigawa M, Shiosakai K, Yamanouchi N, Shiozawa T, Yamaguchi F. Safety of the long-acting neuraminidase inhibitor laninamivir octanoate hydrate in post-marketing surveillance. Int J Antimicrob Agents. 2012 Nov;40(5):381-8. doi: 10.1016/j.ijantimicag.2012.06.017. Epub 2012 Aug 4. PMID: 22871369.

24: Katsumi Y, Otabe O, Matsui F, Kidowaki S, Mibayashi A, Tsuma Y, Ito H. Effect of a single inhalation of laninamivir octanoate in children with influenza. Pediatrics. 2012 Jun;129(6):e1431-6. doi: 10.1542/peds.2011-2054. Epub 2012 May 21. PMID: 22614774.

25: Ishizuka H, Toyama K, Yoshiba S, Okabe H, Furuie H. Intrapulmonary distribution and pharmacokinetics of laninamivir, a neuraminidase inhibitor, after a single inhaled administration of its prodrug, laninamivir octanoate, in healthy volunteers. Antimicrob Agents Chemother. 2012 Jul;56(7):3873-8. doi: 10.1128/AAC.06456-11. Epub 2012 Apr 23. PMID: 22526307; PMCID: PMC3393442.

26: Ikematsu H, Kawai N. Laninamivir octanoate: a new long-acting neuraminidase inhibitor for the treatment of influenza. Expert Rev Anti Infect Ther. 2011 Oct;9(10):851-7. doi: 10.1586/eri.11.112. PMID: 21973296.

27: Kubo S, Kakuta M, Yamashita M. [In vitro and in vivo effects of a long- acting anti-influenza agent CS-8958 (laninamivir octanoate, Inavir) against pandemic (H1N1) 2009 influenza viruses]. Jpn J Antibiot. 2010 Oct;63(5):337-46. Japanese. PMID: 21268406.

28: Watanabe A, Chang SC, Kim MJ, Chu DW, Ohashi Y; MARVEL Study Group. Long- acting neuraminidase inhibitor laninamivir octanoate versus oseltamivir for treatment of influenza: A double-blind, randomized, noninferiority clinical trial. Clin Infect Dis. 2010 Nov 15;51(10):1167-75. doi: 10.1086/656802. Epub 2010 Oct 11. PMID: 20936975.

29: Sugaya N, Ohashi Y. Long-acting neuraminidase inhibitor laninamivir octanoate (CS-8958) versus oseltamivir as treatment for children with influenza virus infection. Antimicrob Agents Chemother. 2010 Jun;54(6):2575-82. doi: 10.1128/AAC.01755-09. Epub 2010 Apr 5. PMID: 20368393; PMCID: PMC2876358.