Azithromycin

Azithromycin is an azalide macrolide antibiotic that inhibits bacterial 50S ribosomal protein synthesis, valued for its long tissue half-life enabling short, convenient dosing courses for respiratory and sexually transmitted infections. Simson Pharma's Azithromycin reference standard and impurities support the high-volume compendial testing this widely prescribed antibiotic requires.

Simson Pharma Global Ltd. (UK) and Simson Pharma Global LLC (USA) supply high-quality Azithromycin Reference Standards, pharmacopoeial reference materials, and its related impurities to pharmaceutical manufacturers, CROs, analytical laboratories, universities, and regulatory organizations worldwide. To service the Europe and America market efficiently, Simson Pharma Limited has set up Simson Pharma Global Ltd. in United Kingdom and Simson Pharma Global LLC in USA respectively.

Pharmaceutical Reference Standards / Impurity Standards

Azithromycin Dihydrate
Azithromycin Dihydrate
  • CAT. No.A130000
  • CAS. No.117772-70-0
  • Mol. F.C38H72N2O12.2H2O
  • Mol. W.749.00 g/mol
  • Stock Status:Instock
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Azithromycin
Azithromycin
  • CAT. No.A130000A
  • CAS. No.83905-01-5
  • Mol. F.C38H72N2O12
  • Mol. W.748.98 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity A
Azithromycin EP Impurity A
  • CAT. No.A130001
  • CAS. No.76801-85-9
  • Mol. F.C37H70N2O12
  • Mol. W.734.96 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity B
Azithromycin EP Impurity B
  • CAT. No.A130002
  • CAS. No.307974-61-4
  • Mol. F.C38H72N2O11
  • Mol. W.733.00 g/mol
  • Stock Status:Limited Stock
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Azithromycin EP Impurity C
Azithromycin EP Impurity C
  • CAT. No.A130003
  • CAS. No.620169-47-3
  • Mol. F.C37H70N2O12
  • Mol. W.735.00 g/mol
  • Stock Status:Under Synthesis
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Azithromycin EP Impurity D
Azithromycin EP Impurity D
  • CAT. No.A130004
  • CAS. No.612069-26-8
  • Mol. F.C38H72N2O13
  • Mol. W.765.00 g/mol
  • Stock Status:Limited Stock
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Azithromycin EP Impurity E
Azithromycin EP Impurity E
  • CAT. No.A130005
  • CAS. No.612069-27-9
  • Mol. F.C36H68N2O12
  • Mol. W.720.93 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity F
Azithromycin EP Impurity F
  • CAT. No.A130006
  • CAS. No.612069-28-0
  • Mol. F.C38H70N2O13
  • Mol. W.762.97 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity G
Azithromycin EP Impurity G
  • CAT. No.A130007
  • CAS. No.612069-31-5
  • Mol. F.C44H76N2O14S
  • Mol. W.889.14 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity H
Azithromycin EP Impurity H
  • CAT. No.A130008
  • CAS. No.612069-30-4
  • Mol. F.C45H77N3O15S
  • Mol. W.932.17 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity I
Azithromycin EP Impurity I
  • CAT. No.A130009
  • CAS. No.172617-84-4
  • Mol. F.C37H70N2O12
  • Mol. W.734.96 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity J
Azithromycin EP Impurity J
  • CAT. No.A130010
  • CAS. No.117693-41-1
  • Mol. F.C30H58N2O9
  • Mol. W.590.79 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity L
Azithromycin EP Impurity L
  • CAT. No.A130011
  • CAS. No.90503-06-3
  • Mol. F.C38H72N2O13
  • Mol. W.764.98 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity M
Azithromycin EP Impurity M
  • CAT. No.A130012
  • CAS. No.765927-71-7
  • Mol. F.C37H68N2O13
  • Mol. W.748.94 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity N
Azithromycin EP Impurity N
  • CAT. No.A130013
  • CAS. No.612069-25-7
  • Mol. F.C36H65NO13
  • Mol. W.719.90 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity O
Azithromycin EP Impurity O
  • CAT. No.A130014
  • CAS. No.763924-54-5
  • Mol. F.C39H74N2O12
  • Mol. W.763.01 g/mol
  • Stock Status:Under Synthesis
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N-Formyl-N-Dimethyl Impurity
N-Formyl-N-Dimethyl Impurity
  • CAT. No.A130015
  • CAS. No.NA
  • Mol. F.NA
  • Mol. W.NA
  • Stock Status:Custom Synthesis
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Azithromycin EP Impurity S
Azithromycin EP Impurity S
  • CAT. No.A130016
  • CAS. No.NA
  • Mol. F.C37H66N2O12
  • Mol. W.730.93 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin N-Ethyl Analog
Azithromycin N-Ethyl Analog
  • CAT. No.A130017
  • CAS. No.92594-45-1
  • Mol. F.C39H74N2O12
  • Mol. W.763.00 g/mol
  • Stock Status:Instock
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Atorvastatin Diketo Amide Impurity
Atorvastatin Diketo Amide Impurity
  • CAT. No.A130021
  • CAS. No.125971-96-2
  • Mol. F.C26H24FNO3
  • Mol. W.417.47 g/mol
  • Stock Status:Instock
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Azithromycin EP Impurity K
Azithromycin EP Impurity K
  • CAT. No.A130024
  • CAS. No.612534-95-9
  • Mol. F.C38H70N2O13
  • Mol. W.762.99 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin EP Impurity Q
Azithromycin EP Impurity Q
  • CAT. No.A130026
  • CAS. No.2095879-65-3
  • Mol. F.C44H75N3O15S
  • Mol. W.918.10 g/mol
  • Stock Status:Instock
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3-Hydroxy Azithromycinoic Acid Sodium
3-Hydroxy Azithromycinoic Acid Sodium
  • CAT. No.A130027
  • CAS. No.2365312-76-9 (free base)
  • Mol. F.C30H59N2O10.Na
  • Mol. W.630.81 g/mol
  • Stock Status:Instock
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Azithromycin N-Ethyl
Azithromycin N-Ethyl
  • CAT. No.A130028
  • CAS. No.92594-45-1
  • Mol. F.C39H74N2O12
  • Mol. W.763.01 g/mol
  • Stock Status:Custom Synthesis
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5,10,15,20-Tetraphenyl-21h,23h-porphine iron(iii) chloride
5,10,15,20-Tetraphenyl-21h,23h-porphine iron(iii) chloride
  • CAT. No.A130029
  • CAS. No.16456-81-8
  • Mol. F.C44H28ClFeN4
  • Mol. W.704.03 g/mol
  • Stock Status:Custom Synthesis
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4``-keto-9a-azithromycin
4``-keto-9a-azithromycin
  • CAT. No.A130030
  • CAS. No.92395-24-9
  • Mol. F.C38H70N2O12
  • Mol. W.746.97 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin Impurity 3 Sodium
Azithromycin Impurity 3 Sodium
  • CAT. No.A130031
  • CAS. No.NA
  • Mol. F.C38H73N2O13.Na
  • Mol. W.788.98 g/mol
  • Stock Status:Under Synthesis
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N-Nitroso Azithromycin EP Impurity A
N-Nitroso Azithromycin EP Impurity A
  • CAT. No.A130032
  • CAS. No.NA
  • Mol. F.C37H69N3O13
  • Mol. W.764.00 g/mol
  • Stock Status:Instock
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N-Nitroso Azithromycin EP Impurity I
N-Nitroso Azithromycin EP Impurity I
  • CAT. No.A130033
  • CAS. No.NA
  • Mol. F.C37H69N3O13
  • Mol. W.764.00 g/mol
  • Stock Status:Instock
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3-Hydroxy Azithromycinoic Acid
3-Hydroxy Azithromycinoic Acid
  • CAT. No.A130034
  • CAS. No.NA
  • Mol. F.C30H60N2O10
  • Mol. W.608.80 g/mol
  • Stock Status:Under Synthesis
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N-Nitroso Azithromycin EP Impurity M
N-Nitroso Azithromycin EP Impurity M
  • CAT. No.A130037
  • CAS. No.NA
  • Mol. F.C37H67N3O14
  • Mol. W.777.94 g/mol
  • Stock Status:Custom Synthesis
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N-Desmethyl Azithromycin B
N-Desmethyl Azithromycin B
  • CAT. No.A130039
  • CAS. No.857078-26-3
  • Mol. F.C37H70N2O11
  • Mol. W.718.96 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin Impurity 4
Azithromycin Impurity 4
  • CAT. No.A130040
  • CAS. No.620169-48-4
  • Mol. F.C36H68N2O12
  • Mol. W.720.93 g/mol
  • Stock Status:Custom Synthesis
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Azaerythromycin C
Azaerythromycin C
  • CAT. No.A130041
  • CAS. No.NA
  • Mol. F.C36H68N2O12
  • Mol. W.720.94 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin Impurity 2
Azithromycin Impurity 2
  • CAT. No.A130043
  • CAS. No.NA
  • Mol. F.C38H74N2O13
  • Mol. W.767 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin Impurity 1
Azithromycin Impurity 1
  • CAT. No.A130044
  • CAS. No.905845-82-1
  • Mol. F.C37H70N2O13
  • Mol. W.750.97 g/mol
  • Stock Status:Custom Synthesis
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Azithromycin Impurity 5
Azithromycin Impurity 5
  • CAT. No.A130045
  • CAS. No.NA
  • Mol. F.C36H64N2O12
  • Mol. W.716.90 g/mol
  • Stock Status:Custom Synthesis
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Metabolites

Descladinose 6-N-Desmethyl Azithromycin
Descladinose 6-N-Desmethyl Azithromycin
  • CAT. No.A130036
  • CAS. No.111247-94-0
  • Mol. F.C29H56N2O9
  • Mol. W.576.76 g/mol
  • Stock Status:Custom Synthesis
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Isotope Labelled Compounds

Azithromycin-13C D3
Azithromycin-13C D3
  • CAT. No.A130022
  • CAS. No.83905-01-5(Unlabeled)
  • Mol. F.C3713CH69D3N2O12
  • Mol. W.753.01 g/mol
  • Stock Status:Under Synthesis
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Azithromycin D3
Azithromycin D3
  • CAT. No.A130023
  • CAS. No.163921-65-1
  • Mol. F.C38H69D3N2O12
  • Mol. W.752.00 g/mol
  • Stock Status:Instock
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Azithromycin-D5
Azithromycin-D5
  • CAT. No.A130038
  • CAS. No.NA
  • Mol. F.C38H67D5N2O12
  • Mol. W.754.02 g/mol
  • Stock Status:Custom Synthesis
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