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Impurities and reference standards

Azithromycin B

Also known as Azithromycin impurity b, Azithromycin impurity b (ep impurity), 3-Deoxyazithromycin

CAS 307974-61-4Formula C38H72N2O11Molar mass 733.00 g/molEC 893-271-7
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard 4 suppliers listed
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Azithromycin B chemical structure, C38H72N2O11, CAS 307974-61-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
307974-61-4
Formula
C38H72N2O11
Molar mass
733.00 g/mol
EC number
893-271-7
HS code
293499
Category
Impurities and reference standards

What is Azithromycin B?

Plain description, key identifiers and synonyms

Azithromycin B is a chemical substance with the molecular formula C38H72N2O11 and a molar mass of 733.00 g/mol. Its CAS registry number is 307974-61-4. The IUPAC name is (2R,3R,4S,5R,8R,10R,11R,12S,13S,14R)-11-[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-2-ethyl-4,10-dihydroxy-13-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(2R,3R,4S,5R,8R,10R,11R,12S,13S,14R)-11-[(2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyloxan-2-yl]oxy-2-ethyl-4,10-dihydroxy-13-[(2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one
CAS number
307974-61-4 CAS number cross-checked
EC number
893-271-7
Molecular formula
C38H72N2O11
UNII
59DVP7BUWJ
InChIKey
JBYIGHZCRVMHAK-VINPOOLWSA-N
InChI
InChI=1S/C38H72N2O11/c1-15-28-22(4)30(41)25(7)40(13)19-20(2)17-37(9,45)34(51-36-31(42)27(39(11)12)16-21(3)47-36)23(5)32(24(6)35(44)49-28)50-29-18-38(10,46-14)33(43)26(8)48-29/h20-34,36,41-43,45H,15-19H2,1-14H3/t20-,21-,22+,23+,24-,25-,26+,27+,28-,29+,30+,31-,32+,33+,34-,36+,37-,38-/m1/s1
Canonical SMILES
CCC1OC(=O)C(C)C(OC2CC(C)(OC)C(O)C(C)O2)C(C)C(OC2OC(C)CC(N(C)C)C2O)C(C)(O)CC(C)CN(C)C(C)C(O)C1C
Isomeric SMILES
CC[C@@H]1[C@@H]([C@@H]([C@H](N(C[C@@H](C[C@@]([C@@H]([C@H]([C@@H]([C@H](C(=O)O1)C)O[C@H]2C[C@@]([C@H]([C@@H](O2)C)O)(C)OC)C)O[C@H]3[C@@H]([C@H](C[C@H](O3)C)N(C)C)O)(C)O)C)C)C)O)C

Synonyms

  • Azithromycin impurity b
  • Azithromycin impurity b (ep impurity)
  • 3-Deoxyazithromycin
  • Azithromycin EP Impurity B
  • AzithromycinB
  • Azithromycin Impurity 2
  • 3-deoxyazithromycin (azithromycin B)

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
733.00 g/molcalc.
Exact mass
732.5136 Dacalc.
LogP (octanol/water)
2.79calc.
Topological polar surface area
159.9 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
13calc.
Rotatable bonds
7calc.
Heavy atoms
51calc.
Rings
3calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.97calc.
Formal charge
0calc.
Stereocentres
18calc.
Lipinski rule of five
Fails (2 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=C1CC(OC2CCCCO2)CC(OC2CCCCO2)CCCCNCCCCO1

O=C1CC(OC2CCCCO2)CC(OC2CCCCO2)CCCCNCCCCO1

3 rings, 30 atoms.

45 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H317May cause an allergic skin reaction.
  • H334May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Precautionary statements (15)
  • P233Keep container tightly closed.
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P342 + P316If experiencing respiratory symptoms: Get emergency medical help immediately.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403Store in a well-ventilated place.
  • 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

Azithromycin B suppliers

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

All 4 suppliers
4 of 4 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

4 suppliers in 2 countries

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Azithromycin B 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.

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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 Azithromycin B is traded under.

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Azithromycin B, based on the data on this page

What is Azithromycin B?

Azithromycin B is a chemical substance with the molecular formula C38H72N2O11 and a molar mass of 733.00 g/mol. Its CAS registry number is 307974-61-4.

What is the CAS number of Azithromycin B?

The CAS registry number of Azithromycin B is 307974-61-4.

What is the molecular formula and weight of Azithromycin B?

The molecular formula of Azithromycin B is C38H72N2O11 and its molar mass is 733.00 g/mol.

Is Azithromycin B hazardous?

Azithromycin B carries the GHS signal word "Danger". Main hazards: may cause an allergic skin reaction, may cause allergy or asthma symptoms or breathing difficulties if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Azithromycin B?

Azithromycin B is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Azithromycin B?

CompoundList lists 4 suppliers of Azithromycin B in India and China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Azithromycin B in India?

3 suppliers in India list Azithromycin B on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Azithromycin B?

Suppliers quote Azithromycin B 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 Azithromycin B

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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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