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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Azithromycin and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Azithromycin impurities, metabolites, nitrosamine derivatives (N-NO compounds), and stable isotope-labeled products. These reference standards play a critical role in pharmaceutical R&D, supporting activities such as product formulation, ANDA and DMF submissions, quality assurance, analytical method development, and stability assessments.
All Azithromycin-related substances undergo comprehensive characterization and are delivered with complete Certificates of Analysis and supporting analytical documentation to ensure regulatory adherence. Upon request, we can offer EP/USP traceable standards. Our products are routinely re-evaluated to maintain consistent quality and performance.

Azithromycin Dihydrate
CAT No: CL-AZMN-01 CAS No: 117772-70-0 Mol Wt: 749.0 : (18.0) Mol F: C38H72N2O12 : 2H2O Inv Status: Custom Synthesis
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-a-L-ribo-hexopyranosyl)oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3-(dimethylamino)-?D-xylo-hexopyranosyl]oxy]-1-oxa-6-azacyclopentadecan-15-one dihydrate ; (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-a-l-ribo-hexopyranosyl)oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3-(dimethylamino)-?d-xylo-hexopyranosyl]oxy]-1-oxa-6-azacyclopentadecan-15-one dihydrate (as per USP)
Azithromycin EP Impurity A
CAT No: CL-AZMN-02 CAS No: 76801-85-9 Mol Wt: 735 Mol F: C37H70N2O12 Inv Status: In Stock
Chemical Name: 9-Deoxo-9a-aza-9a-homo Erythromycin A
Azithromycin EP Impurity B
CAT No: CL-AZMN-03 CAS No: 307974-61-4 Mol Wt: 733 Mol F: C38H72N2O11 Inv Status: Custom Synthesis
Chemical Name: 3-Deoxyazithromycin
Azithromycin EP Impurity C
CAT No: CL-AZMN-04 CAS No: 620169-47-3 Mol Wt: 735 Mol F: C37H70N2O12 Inv Status: Custom Synthesis
Chemical Name: 3-O-Demethyl Azithromycin
Azithromycin EP Impurity D
CAT No: CL-AZMN-05 CAS No: 612069-26-8 Mol Wt: 765 Mol F: C38H72N2O13 Inv Status: Custom Synthesis
Chemical Name: 14-Demethyl-14-(hydroxymethyl)azithromycin
Azithromycin EP Impurity E
CAT No: CL-AZMN-06 CAS No: 612069-27-9 Mol Wt: 720.9 Mol F: C36H68N2O12 Inv Status: Custom Synthesis
Chemical Name: 3?-(N,N-Didemethyl)azithromycin
Azithromycin EP Impurity F
CAT No: CL-AZMN-07 CAS No: 612069-28-0 Mol Wt: 762.97 Mol F: C38H70N2O13 Inv Status: Custom Synthesis
Chemical Name: N-((2S,3R,6R)-2-(((2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,6,8,10,12,14-heptamethyl-15-oxo-1-oxa-6-azacyclopentadecan-11-yl)oxy)-3-hydroxy-6-methyltetrahydro-2H-pyran-4-yl)-N-methylformamide
Azithromycin EP Impurity G
CAT No: CL-AZMN-08 CAS No: 612069-31-5 Mol Wt: 889.1 Mol F: C44H76N2O14S Inv Status: Custom Synthesis
Chemical Name: 3?-N-Demethyl-3?-N-[(4-methylphenyl)sulfonyl]azithromycin
Azithromycin EP Impurity H
CAT No: CL-AZMN-09 CAS No: 612069-30-4 Mol Wt: 932.2 Mol F: C45H77N3O15S Inv Status: Custom Synthesis
Chemical Name: 3?-N-[[4-(Acetylamino)phenyl]sulfonyl]-3?-N-demethylazithromycin
Azithromycin EP Impurity I
CAT No: CL-AZMN-10 CAS No: 172617-84-4 Mol Wt: 735 Mol F: C37H70N2O12 Inv Status: Custom Synthesis
Chemical Name: 3?-N-Demethylazithromycin
Azithromycin EP Impurity J
CAT No: CL-AZMN-11 CAS No: 117693-41-1 Mol Wt: 590.8 Mol F: C30H58N2O9 Inv Status: In Stock
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-(((2S,3R,4S)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2-ethyl-3,4,10,13-tetrahydroxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one
Azithromycin EP Impurity K
CAT No: CL-AZMN-12 CAS No: 612534-95-9 Mol Wt: 763 Mol F: C38H70N2O13 Inv Status: Custom Synthesis
Chemical Name: Azithromycin E ; C14,1?-Epoxy Azithromycin
Azithromycin EP Impurity L
CAT No: CL-AZMN-13 CAS No: 90503-06-3 Mol Wt: 765 Mol F: C38H72N2O13 Inv Status: In Stock
Chemical Name: Azithromycin 3'-N-Oxide ; Azithromycin N-Oxide
Azithromycin EP Impurity M
CAT No: CL-AZMN-14 CAS No: 765927-71-7 Mol Wt: 749 Mol F: C37H68N2O13 Inv Status: Custom Synthesis
Chemical Name: 3?-(N,N-Didemethyl)-3?-N-formylazithromycin
Azithromycin EP Impurity N
CAT No: CL-AZMN-15 CAS No: 612069-25-7 Mol Wt: 719.9 Mol F: C36H65NO13 Inv Status: Custom Synthesis
Chemical Name: 3?-De(Dimethylamino)-3?-oxoazithromycin ; 3
Azithromycin EP Impurity O
CAT No: CL-AZMN-16 CAS No: 763924-54-5 Mol Wt: 763 Mol F: C39H74N2O12 Inv Status: Custom Synthesis
Chemical Name: 2-Desethyl-2-propylazithromycin
Azithromycin Impurity 4
CAT No: CL-AZMN-17 CAS No: NA Mol Wt: 730.9 Mol F: C37H66N2O12 Inv Status: Custom Synthesis
Chemical Name: (3R,4R,5S,6R,9R,10S,11S,12R,13S,15R,Z)-12-(((2S,3S,4S)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-6-ethyl-4,5-dihydroxy-10-(((2R,4R,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,9,11,13,15-hexamethyl-7,16-dioxa-2-azabicyclo[11.2.1]hexadec-1-en-8-one
Azithromycin Impurity R
CAT No: CL-AZMN-18 CAS No: 161193-44-8 Mol Wt: 730.9 Mol F: C37H66N2O12 Inv Status: Custom Synthesis
Chemical Name: (1R,2R,3R,6R,7S,8S,9R,10R,12R,15R)-9-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-3-ethyl-2,10-dihydroxy-7-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-2,6,8,10,12,15-hexamethyl-4,16-dioxa-14-azabicyclo[11.2.1]hexadec-13-en-5-one
3-Hydroxy Azithromycinoic Acid Sodium Salt
CAT No: CL-AZMN-19 CAS No: .jpg Mol Wt: 607.81 : 23.0 Mol F: C30H59N2O10 : Na Inv Status: Custom Synthesis
Chemical Name: (2R,3S,4S,5R,8R)-5-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-3,6-dihydroxy-2,4,6,8-tetramethyl-9-(methyl((2R,3R,4R,5R)-3,4,5-trihydroxy-4-methylheptan-2-yl)amino)nonanoic acid, sodium salt
Azithromycin EP Impurity Q
CAT No: CL-AZMN-20 CAS No: 2095879-65-3 Mol Wt: 918.1 Mol F: C44H75N3O15S Inv Status: In Stock
Chemical Name: N-(4-(N-((2S,3R,4S,6R)-2-(((2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,6,8,10,12,14-heptamethyl-15-oxo-1-oxa-6-azacyclopentadecan-11-yl)oxy)-3-hydroxy-6-methyltetrahydro-2H-pyran-4-yl)sulfamoyl)phenyl)acetamide
Azithromycin Impurity 2
CAT No: CL-AZMN-21 CAS No: NA Mol Wt: 779 Mol F: C38H70N2O14 Inv Status: Custom Synthesis
Chemical Name: methyl ((2S,3R,4S)-2-(((2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,6,8,10,12,14-heptamethyl-15-oxo-1-oxa-6-azacyclopentadecan-11-yl)oxy)-3-hydroxy-6-methyltetrahydro-2H-pyran-4-yl)carbamate
Azithromycin Impurity 3 Sodium Salt
CAT No: CL-AZMN-22 CAS No: NA Mol Wt: 766.01 : 23.0 Mol F: C38H73N2O13 : Na Inv Status: Custom Synthesis
Chemical Name: sodium (2R,3S,4S,5R,6R,8R)-5-(((2S,3R,4S)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-6-hydroxy-3-(((2R,4R,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-2,4,6,8-tetramethyl-9-(methyl((2R,3R,4R,5R)-3,4,5-trihydroxy-4-methylheptan-2-yl)amino)nonanoate
Azaerythromycin A 11,12-Hydrogen Borate
CAT No: CL-AZMN-23 CAS No: 194809-66-0 Mol Wt: 760.8 Mol F: C37H69BN2O13 Inv Status: Custom Synthesis
Chemical Name: (3aS,4R,7R,8S,9S,10R,11R,13R,16R,16aR)-10-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-4-ethyl-2,11-dihydroxy-8-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3a,7,9,11,13,16-hexamethyldodecahydro-[1,3,2]dioxaborolo[4,5-c][1]oxa[6]azacyclopentadecin-6(4H)-one
Azithromycin Impurity P
CAT No: CL-AZMN-25 CAS No: 92594-45-1 Mol Wt: 763 Mol F: C39H74N2O12 Inv Status: Custom Synthesis
Chemical Name: 11-((4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2,6-diethyl-3,4,10-trihydroxy-13-((5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,8,10,12,14-hexamethyl-1-oxa-6-azacyclopentadecan-15-one
Azithromycin
CAT No: CL-AZMN-26 CAS No: 83905-01-5 Mol Wt: 749 Mol F: C38H72N2O12 Inv Status: In Stock
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one
Azithromycin 13C, D3
CAT No: CL-AZMN-35 CAS No: NA Mol Wt: 753 Mol F: C3713CH69D3N2O12 Inv Status: Custom Synthesis
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-11-(((2S,3R,4S,6R)-3-hydroxy-6-methyl-4-(methyl(methyl-13C-d3)amino)tetrahydro-2H-pyran-2-yl)oxy)-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one
Azithromycin D5
CAT No: CL-AZMN-36 CAS No: NA Mol Wt: 754 Mol F: C38H67D5N2O12 Inv Status: Custom Synthesis
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,8,10,12,14-hexamethyl-6-(methyl-d3)-1-oxa-6-azacyclopentadecan-15-one-7,7-d2
Azithromycin D3
CAT No: CL-AZMN-37 CAS No: 163921-65-1 Mol Wt: 752 Mol F: C38H69D3N2O12 Inv Status: Custom Synthesis
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-11-(((2S,3R,4S,6R)-4-(dimethylamino)-3-hydroxy-6-methyltetrahydro-2H-pyran-2-yl)oxy)-2-ethyl-3,4,10-trihydroxy-13-(((2R,4R,5S,6S)-5-hydroxy-4-methoxy-4,6-dimethyltetrahydro-2H-pyran-2-yl)oxy)-3,5,8,10,12,14-hexamethyl-6-(methyl-d3)-1-oxa-6-azacyclopentadecan-15-one
Azithromycin Aglycone
CAT No: CL-AZMN-38 CAS No: 117693-42-2 Mol Wt: 433.6 Mol F: C22H43NO7 Inv Status: In Stock
Chemical Name: (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-2-ethyl-3,4,10,11,13-pentahydroxy-3,5,6,8,10,12,14-heptamethyl-1-oxa-6-azacyclopentadecan-15-one
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