CompoundList
Sign in
Impurities and reference standards

Ivermectin B1a

Also known as Dihydroavermectin B1a, 22,23-Dihydroavermectin B1a, avermectin H2B1a

CAS 71827-03-7Formula C48H74O14Molar mass 875.11 g/molEC 276-046-2
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Harmful or irritant, Serious health hazard, Hazardous to the environment 45 suppliers listed
Get quotes Compare 45 suppliers
Ivermectin B1a chemical structure, C48H74O14, CAS 71827-03-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
71827-03-7
Formula
C48H74O14
Molar mass
875.11 g/mol
EC number
276-046-2
HS code
293220
Category
Impurities and reference standards

What is Ivermectin B1a?

Plain description, key identifiers and synonyms

LSM-5397 is a milbemycin.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(1R,4S,5'S,6R,6'R,8R,10E,12S,13S,14E,16E,20R,21R,24S)-6'-[(2S)-butan-2-yl]-21,24-dihydroxy-12-[(2R,4S,5S,6S)-5-[(2S,4S,5S,6S)-5-hydroxy-4-methoxy-6-methyloxan-2-yl]oxy-4-methoxy-6-methyloxan-2-yl]oxy-5',11,13,22-tetramethylspiro[3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene-6,2'-oxane]-2-one
CAS number
71827-03-7 CAS number cross-checkedOther or deprecated CAS: 70161-11-4
EC numbers
276-046-2, 615-075-0
Molecular formula
C48H74O14
UNII
91Y2202OUW
InChIKey
AZSNMRSAGSSBNP-XPNPUAGNSA-N
InChI
InChI=1S/C48H74O14/c1-11-25(2)43-28(5)17-18-47(62-43)23-34-20-33(61-47)16-15-27(4)42(26(3)13-12-14-32-24-55-45-40(49)29(6)19-35(46(51)58-34)48(32,45)52)59-39-22-37(54-10)44(31(8)57-39)60-38-21-36(53-9)41(50)30(7)56-38/h12-15,19,25-26,28,30-31,33-45,49-50,52H,11,16-18,20-24H2,1-10H3/b13-12+,27-15+,32-14+/t25-,26-,28-,30-,31-,33+,34-,35-,36-,37-,38-,39-,40+,41-,42-,43+,44-,45+,47+,48+/m0/s1
Canonical SMILES
CCC(C)C1OC2(CCC1C)CC1CC(CC=C(C)C(OC3CC(OC)C(OC4CC(OC)C(O)C(C)O4)C(C)O3)C(C)C=CC=C3COC4C(O)C(C)=CC(C(=O)O1)C34O)O2
Isomeric SMILES
CC[C@H](C)[C@@H]1[C@H](CC[C@@]2(O1)C[C@@H]3C[C@H](O2)C/C=C(/[C@H]([C@H](/C=C/C=C/4\CO[C@H]5[C@@]4([C@@H](C=C([C@H]5O)C)C(=O)O3)O)C)O[C@H]6C[C@@H]([C@H]([C@@H](O6)C)O[C@H]7C[C@@H]([C@H]([C@@H](O7)C)O)OC)OC)\C)C

Synonyms

  • Dihydroavermectin B1a
  • 22,23-Dihydroavermectin B1a
  • avermectin H2B1a
  • 5-O-demethyl-22,23-dihydroavermectin A1a
  • H2B1a
  • Avermectin A1a, 5-O-demethyl-22,23-dihydro-
  • Ivermectin Component B1a
  • Ivermectin B1a-d2
  • Ivermectin B1a (>85%)
  • Hyvermectin,
  • Mectizan,
  • Eqvalan,
  • Ivomec,
  • Ivermectin (IVM)
  • IVM
  • dihydro avermectin Bla
  • Ivermectin Impurity 39
  • Ivermectin (MK-0933)
  • Ivermectin - Bio-X trade mark
  • 71827-03-7 (Unlabelled)
  • Spiro[11,15-methano-2H,13H,17H-furo[4,3,2-pq][2,6]benzodioxacyclooctadecin-13,2'-[2H]pyran], Avermectin A1a Deriv.
  • 5-O-demethyl-22,23-dihydro-avermectin A1a
  • 22,23-Dihydroavermectin b1a, ivermectin
  • 5-O-Demethyl-22,23-dihydro-avermectin A1a-D2
  • Avermectin A1a, 22,23-dihydro-5-O-demethyl-
Show all 34 synonyms
  • Ivermectin, British Pharmacopoeia (BP) Reference Standard
  • Ivermectin, European Pharmacopoeia (EP) Reference Standard
  • Ivermectin, United States Pharmacopeia (USP) Reference Standard
  • oxan-2-yl]oxy}-5,11',13',22'-tetramethyl-3',7',19'-trio
  • Ivermectin, Pharmaceutical Secondary Standard, Certified Reference Material
  • (2aE,4E,5'S,6S,6'R,7S,8E,11R,13R,15S,17aR,20R,20aR,20bS)-6'-[(2S)-butan-2-yl]-20,20b-dihydroxy-5',6,8,19-tetramethyl-17
  • oxo-3',4',5',6,6',10,11,14,15,17,17a,20,20a,20b-tetradecahydro-2H,7H-spiro[11,15-methanofuro[4,3,2-pq][2,6]benzodioxacy
  • clooctadecine-13,2'-pyran]-7-yl 2,6-dideoxy-4-O-(2,6-dideoxy-3-O-methyl-alpha-L-arabino-hexopyranosyl)-3-O-methyl-alpha-L-arabino-hexopyranoside
  • xaspiro[oxane-2,6'-tetracyclo[15.6.1.1^{4,8}.0^{20,24}]pentacosane]-10',14',16',22'-tetraen-2'-one

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
875.11 g/molcalc.
Exact mass
874.5079 Dacalc.
LogP (octanol/water)
5.6calc.
Topological polar surface area
170.1 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
14calc.
Rotatable bonds
8calc.
Heavy atoms
62calc.
Rings
7calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.81calc.
Formal charge
0calc.
Stereocentres
20calc.
Lipinski rule of five
Fails (3 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1OC2CC(CC=CC(OC3CCC(OC4CCCCO4)CO3)CC=CC=C3COC4CC=CC1C34)OC1(CCCCO1)C2

O=C1OC2CC(CC=CC(OC3CCC(OC4CCCCO4)CO3)CC=CC=C3COC4CC=CC1C34)OC1(CCCCO1)C2

7 rings, 45 atoms.

35 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H300Fatal if swallowed.
  • H312Harmful in contact with skin.
  • H361Suspected of damaging fertility or the unborn child.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
Precautionary statements (17)
  • P203Obtain, read and follow all safety instructions before use.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P302 + P352If on skin: Wash with plenty of water.
  • P317Get medical help.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Ivermectin B1a suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 45 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

45 suppliers in 10 countries

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

Ivermectin B1a price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

Get latest price

Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Ivermectin B1a is traded under.

HS 2932.20Indicative HS code

Lactones

World exports in 2024
$1.97B
−4.7% vs 2023, imports $2.07B
2019 to 2024
Top exporters
  1. China56.3%
  2. India * partner reported7.4%
  3. Germany7.3%
Top importers
  1. United States14.2%
  2. India * partner reported13.5%
  3. Brazil8.5%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Ivermectin B1a is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Ivermectin B1a, based on the data on this page

What is Ivermectin B1a?

LSM-5397 is a milbemycin.

What is the CAS number of Ivermectin B1a?

The CAS registry number of Ivermectin B1a is 71827-03-7. Other or deprecated CAS numbers: 70161-11-4.

What is the molecular formula and weight of Ivermectin B1a?

The molecular formula of Ivermectin B1a is C48H74O14 and its molar mass is 875.11 g/mol.

Is Ivermectin B1a hazardous?

Ivermectin B1a carries the GHS signal word "Danger". Main hazards: fatal if swallowed, harmful in contact with skin, suspected of damaging fertility or the unborn child. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Ivermectin B1a?

Ivermectin B1a is usually classified under HS code 293220 (Lactones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Ivermectin B1a?

CompoundList lists 45 suppliers of Ivermectin B1a in United States, China, United Kingdom, Germany and 6 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Ivermectin B1a?

Suppliers quote Ivermectin B1a on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Ivermectin B1a

Get quotes for Ivermectin B1a

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell Ivermectin B1a
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Ivermectin B1a with a 3D view, its CAS number where known and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/ivermectin-b1a-71827-03-7" title="Ivermectin B1a structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Impurities and reference standards or HS code 293220

45 suppliers
Free quotes, contact stays private
Get quotes