Ivermectin B1b 

Ivermectin B1b is the minor component of Ivermectin. Ivermectin, a potent anti-parasitic agent, inhibits the replication of SARS-CoV-2 in cell culture^[1][2].

Ivermectin and Ivermectin B1b are the most potent inhibitors of contraction and motility in both susceptible isolates (H. contortus McMaster and and O. circumcincta McMaster) also show the highest resistance ratios in both species^[3].
Vermectin is a macrocyclic lactone that acts as a positive allosteric modulator of α7 nicotinic acetylcholine receptors (nAChRs) but has no modulatory activity on 5-HT3 receptors^[4].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Ivermectin B1b causes snail death^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

861.07

C₄₇H₇₂O₁₄

70209-81-3

CC([C@H]1O[C@]2(CC[C@@H]1C)C[C@](O3)([H])C[C@](C/C=C([C@H]([C@H](/C=C/C=C4[C@@]5(O)[C@](C=C(C)[C@@H](O)[C@@]5([H])OC/4)([H])C3=O)C)O[C@@]6([H])C[C@@H]([C@@H](O[C@@]7([H])C[C@@H]([C@@H](O)[C@H](C)O7)OC)[C@H](C)O6)OC)\C)([H])O2)C

Room temperature in continental US; may vary elsewhere.

Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. Katz N, et al. Ivermectin efficacy against Biomphalaria, intermediate host snail vectors of Schistosomiasis. J Antibiot (Tokyo). 2017;70(5):680-684.  [Content Brief]

  [2]. Bray M, et al. Ivermectin and COVID-19: A report in Antiviral Research, widespread interest, an FDA warning, two letters to the editor and the authors' responses. Antiviral Res. 2020;178:104805.  [Content Brief]

  [3]. Demeler J, et al. Measuring the effect of avermectins and milbemycins on somatic muscle contraction of adult Haemonchus contortus and on motility of Ostertagia circumcincta in vitro. Parasitology. 2014;141(7):948-956.  [Content Brief]

  [4]. Collins T, et al. Nicotinic acetylcholine receptor transmembrane mutations convert ivermectin from a positive to a negative allosteric modulator. Mol Pharmacol. 2010;78(2):198-204.  [Content Brief]