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Impurities and reference standards

Avermectin B1a

Also known as Abamectin B1a, abamectin component B1a, 5-O-Demethylavermectin A1a

CAS 65195-55-3Formula C48H72O14Molar mass 873.09 g/molEC 265-610-3
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 6 suppliers listed
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Avermectin B1a chemical structure, C48H72O14, CAS 65195-55-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
65195-55-3
Formula
C48H72O14
Molar mass
873.09 g/mol
EC number
265-610-3
HS code
293220
Category
Impurities and reference standards

What is Avermectin B1a?

Plain description, key identifiers and synonyms

Avermectin B1a is an avermectin.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(1'R,2R,3S,4'S,6S,8'R,10'E,12'S,13'S,14'E,16'E,20'R,21'R,24'S)-2-[(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-3,11',13',22'-tetramethylspiro[2,3-dihydropyran-6,6'-3,7,19-trioxatetracyclo[15.6.1.14,8.020,24]pentacosa-10,14,16,22-tetraene]-2'-one
CAS number
65195-55-3 CAS number cross-checked
EC number
265-610-3
Molecular formula
C48H72O14
UNII
K54ZMM929K
MDL number
MFCD01939385
InChIKey
RRZXIRBKKLTSOM-XPNPUAGNSA-N
InChI
InChI=1S/C48H72O14/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/h12-15,17-19,25-26,28,30-31,33-45,49-50,52H,11,16,20-24H2,1-10H3/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(C=CC1C)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](C=C[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

  • Abamectin B1a
  • abamectin component B1a
  • 5-O-Demethylavermectin A1a
  • Avermectin B(1)a
  • Avermectin A1a, 5-O-demethyl-
  • Antibiotic C 076B1a
  • Abamectin komponente B1a
  • avermectin B1a (purity >=80 %)
  • Ivermectin EP Impurity A
  • Abamectine
  • Abamectinum
  • Abamectina
  • Antibiotic C 076A1a, 5-O-demethyl-
  • Avermectin A(sub 1a), 5-O-demethyl-
  • Avermectin B1a (>85%)
  • Ivermectin impurity a
  • Avermectin B1a 100 microg/mL in Acetonitrile
  • Abamectin B1a 1000 microg/mL in Acetonitrile
  • 5-O-Demethylavermectin A1a, Abamectin B1a, abamectin component B1a

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
873.09 g/molcalc.
Exact mass
872.4922 Dacalc.
LogP (octanol/water)
5.38calc.
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
0.77calc.
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(C=CCCO1)C2

O=C1OC2CC(CC=CC(OC3CCC(OC4CCCCO4)CO3)CC=CC=C3COC4CC=CC1C34)OC1(C=CCCO1)C2

7 rings, 45 atoms.

46 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)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H300Fatal if swallowed.
  • H330Fatal if inhaled.
  • H361dSuspected of damaging the unborn child.
  • H372Causes damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (20)
  • 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.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P318If exposed or concerned, get medical advice.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Avermectin B1a suppliers

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

All 6 suppliers
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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

6 suppliers in 4 countries

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Avermectin B1a price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Use classes: Pesticides.

Pharmacological actions

  • Anthelmintics

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 606-143-00-0[2]

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Avermectin 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 Avermectin B1a is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

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

What is Avermectin B1a?

Avermectin B1a is an avermectin.

What is the CAS number of Avermectin B1a?

The CAS registry number of Avermectin B1a is 65195-55-3.

What is the molecular formula and weight of Avermectin B1a?

The molecular formula of Avermectin B1a is C48H72O14 and its molar mass is 873.09 g/mol.

What is Avermectin B1a used for?

Use classes: Pesticides.

Is Avermectin B1a hazardous?

Avermectin B1a carries the GHS signal word "Danger". Main hazards: fatal if swallowed, fatal if inhaled, suspected of damaging the unborn child. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Avermectin B1a?

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

Where can I buy Avermectin B1a?

CompoundList lists 6 suppliers of Avermectin B1a in China, Australia, Czech Republic and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Avermectin B1a?

Suppliers quote Avermectin 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 Avermectin B1a

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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