Amoxicillin

Amoxicillin Related Products

Venkatasai is a leading innovator in the field of pharmaceutical reference standards, offering high-quality Reference Standards of Amoxicillin, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope-labeled compounds, and nitrosamines (N-NO products). Our Amoxicillin impurity reference standards play a vital role in pharmaceutical research, supporting product development, ANDA and DMF filings, quality control (QC), method validation, and stability studies. They are also instrumental in identifying unknown impurities and evaluating genotoxic potential. All Amoxicillin-related products are thoroughly characterized and supplied with comprehensive Certificates of Analysis (COA) and analytical data that comply with regulatory standards. EP/USP traceable standards can also be provided upon request. Furthermore, all supplied products undergo periodic re-testing to ensure continued quality and reliability.

Amoxicillin

(2S,5R,6R)-6-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (as per EP): (2S,5R,6R)-6-[(R)-(?)-2-Amino-2-(p-hydroxyphenyl)acetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hep
CAT No: VS-A062000
CAS No: 26787-78-0
Mol.F.: C16H19N3O5S
Mol.Wt.: 365.4
Status: Custom Synthesis

Amoxicillin Close Ring Dimer

((2S,5R,6R)-6-((2R)-2-{2-[(R)-2-Amino-2-(4-hydroxyphenyl)acetamido]-2-[(4S)-4-carboxy-5,5- dimethylthiazolidin-2-yl]acetamido}-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1- azabicyclo[3.2.0]-heptane-2-carboxylic acid)) (as per USP)
CAT No: VS-A062016
CAS No: 73590-06-4
Mol.F.: C32H38N6O10S2
Mol.Wt.: 730.8
Status: Custom Synthesis

Amoxicillin Diketopiperazine

2-(5-(4-hydroxyphenyl)-3,6-dioxopiperazin-2-yl)-5,5-dimethylthiazolidine-4-carboxylic acid
CAT No: VS-A062032
CAS No: 94659-47-9
Mol.F.: C16H19N3O5S
Mol.Wt.: 365.4
Status: Custom Synthesis

Amoxicillin Dimer

(2S,5R,6R)-6-((R)-2-((2S,5R,6R)-6-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxamido)-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
CAT No: VS-A062025
CAS No: N/A
Mol.F.: C32H36N6O9S2
Mol.Wt.: 712.8
Status: Custom Synthesis

Amoxicillin Dimer (penicilloic acid form)

(2R,4S)-2-((R)-1-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-(((R)-2-(((R)-carboxy((2R,4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)methyl)amino)-1-(4-hydroxyphenyl)-2-oxoethyl)amino)-2-oxoethyl)-5,5-dimethylthiazolidine-4-carboxylic acid
CAT No: VS-A062040
CAS No: 210289-72-8
Mol.F.: C32H40N6O11S2
Mol.Wt.: 748.83
Status: Custom Synthesis

Amoxicillin EP Impurity A

(2S,5R,6R)-6-Amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (as per EP and USP)
CAT No: VS-A062004
CAS No: 551-16-6
Mol.F.: C8H12N2O3S
Mol.Wt.: ?216.3
Status: Custom Synthesis

Amoxicillin EP Impurity B

(2S,5R,6R)-6-[[(2S)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid ( As per EP) ; (2S,5R,6R)-6-[(S)-2-Amino-2-(4-hydroxyphenyl)acetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane
CAT No: VS-A062005
CAS No: 26889-93-0
Mol.F.: C16H19N3O5S
Mol.Wt.: ?365.4
Status: Custom Synthesis

Amoxicillin EP Impurity C

(4S)-2-[5-(4-Hydroxyphenyl)-3,6-dioxopiperazin-2-yl]-5,5-dimethylthiazolidine-4-carboxylic acid (As per EP and USP)
CAT No: VS-A062006
CAS No: 2088961-37-7
Mol.F.: C16H19N3O5S
Mol.Wt.: 365.4
Status: Custom Synthesis

Amoxicillin EP Impurity D

(4S)-2-(((R)-2-Amino-2-(4-hydroxyphenyl)acetamido)(carboxy)methyl)-5,5-dimethylthiazolidine-4-carboxylic Acid
CAT No: VS-A062037
CAS No: 1642629-94-4
Mol.F.: C16H21N3O6S
Mol.Wt.: 383.42
Status: Custom Synthesis

Amoxicillin EP Impurity D (Na)

Sodium, (4S)-2-[[[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino]carboxymethyl]-5,5-dimethylthiazolidine-4-carboxylate (as per EP)
CAT No: VS-A062007
CAS No: 1642559-71-4
Mol.F.: C16H20N3O6S : Na
Mol.Wt.: 382.4 : 23.0
Status: Custom Synthesis

Amoxicillin EP Impurity E

?(2RS,4S)-2-[[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]methyl]-5,5-dimethylthiazolidine-4-carboxylic acid (as per EP); (4S)-2-{[(R)-2-Amino-2-(4-hydroxyphenyl)acetamido]methyl}-5,5-dimethylthiazolidine-4-carboxylic acid (as per USP)
CAT No: VS-A062008
CAS No: 1356020-01-3
Mol.F.: C15H21N3O4S
Mol.Wt.: 339.4
Status: Custom Synthesis

Amoxicillin EP Impurity F

3-(4-Hydroxyphenyl)pyrazin-2-ol (as per EP)
CAT No: VS-A062009
CAS No: 126247-63-0
Mol.F.: C10H8N2O2?
Mol.Wt.: ?188.2
Status: Custom Synthesis

Amoxicillin EP Impurity G

(2S,5R,6R)-6-[[(2R)-2-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-2-(4-hydroxy-phenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid (as per EP); (2S,5R,6R)-6-{(R)-2-[(R)-2-Amino-2-(4-hydroxyphenyl)acetamido]-2-(4
CAT No: VS-A062010
CAS No: 188112-75-6
Mol.F.: C24H26N4O7S
Mol.Wt.: ?514.6
Status: Custom Synthesis

Amoxicillin EP Impurity H

(2R)-2-[(2,2-dimethylpropanoyl)amino]-2-(4-hydroxyphenyl)acetic acid (as per EP) ; ((R)-2-(4-Hydroxyphenyl)-2-pivalamidoacetic acid) (as per USP)
CAT No: VS-A062011
CAS No: 205826-86-4
Mol.F.: C13H17NO4?
Mol.Wt.: ?251.3
Status: Custom Synthesis

Amoxicillin EP Impurity I

?(2R)-2-Amino-2-(4-hydroxyphenyl)acetic acid (as per EP); ((R)-2-Amino-2-(4-hydroxyphenyl)acetic acid) (as per USP)
CAT No: VS-A062012
CAS No: 22818-40-2
Mol.F.: C8H9NO3
Mol.Wt.: 167.2
Status: Custom Synthesis

Amoxicillin EP Impurity I (HCl)

(2R)-2-amino-2-(4-hydroxyphenyl)acetic acid Hydrochloride (as per EP); ((R)-2-Amino-2-(4-hydroxyphenyl)acetic acid) Hydrochloride (as per USP)
CAT No: VS-A062013
CAS No: 52067-90-0
Mol.F.: C8H9NO3 : HCl
Mol.Wt.: 167.2 : 36.5
Status: Custom Synthesis

Amoxicillin EP Impurity I (K)

(2R)-2-amino-2-(4-hydroxyphenyl)acetic acid Potassium (as per EP); ((R)-2-Amino-2-(4-hydroxyphenyl)acetic acid) Potassium (as per USP)
CAT No: VS-A062014
CAS No: 71839-16-2
Mol.F.: C8H9NO3 : K
Mol.Wt.: 167.2 : 39.1
Status: Custom Synthesis

Amoxicillin EP Impurity I (Na)

(2R)-2-amino-2-(4-hydroxyphenyl)acetic acid Sodium (as per EP); ((R)-2-Amino-2-(4-hydroxyphenyl)acetic acid) Sodium (as per USP)
CAT No: VS-A062015
CAS No: 55361-61-0
Mol.F.: C8H9NO3 : Na
Mol.Wt.: 167.2 : 23.0
Status: Custom Synthesis

Amoxicillin EP Impurity J

(2S,5R,6R)-6-((2R)-2-(2-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-((4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)acetamido)-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
CAT No: VS-A062029
CAS No: 2088960-43-2
Mol.F.: C32H38N6O10S2
Mol.Wt.: 730.8
Status: Custom Synthesis

Amoxicillin EP Impurity J (2Na)

Disodium ((2S,5R,6R)-6-((2R)-2-{2-[(R)-2-Amino-2-(4-hydroxyphenyl)acetamido]-2-[(4S)-4-carboxy-5,5- dimethylthiazolidin-2-yl]acetamido}-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1- azabicyclo[3.2.0]-heptane-2-carboxylic acid)) (as per USP)
CAT No: VS-A062017
CAS No: 94730-53-7
Mol.F.: C32H38N6O10S2 : 2(Na)
Mol.Wt.: 730.8 : 2(23.0)
Status: Custom Synthesis

Amoxicillin EP Impurity K

(4S)-2-[1-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-2-[[(1R)-2-[[carboxy[(4S)-4-carboxy-5,5-dimethyl-1,3-thiazolidin-2-yl]methyl]amino]-1-(4-hydroxyphenyl)-2-oxoethyl]amino]-2-oxoethyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic Acid
CAT No: VS-A062041
CAS No: 2088961-38-8
Mol.F.: C32H40N6O11S2
Mol.Wt.: 748.82
Status: Custom Synthesis

Amoxicillin EP Impurity K (3Na)

?(2R)-(2R)-2-[(2R,4S)thyl-2-thiazolidinyl]glycyl-(2R)-2-(4-hydroxyphenyl)glycyl-2-[(2R,4S)-4-carboxy-5,5-dimethyl-2-thiazolidinyl]glycine tri sodium salt.
CAT No: VS-A062018
CAS No: N/A
Mol.F.: C32H40N6O11S2 : 3(Na)
Mol.Wt.: 748.8 : 3(23.0)
Status: Custom Synthesis

Amoxicillin EP Impurity L

(2S,5R,6R)-6-[[(2S,5R,6R)-6-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
CAT No: VS-A062019
CAS No: 1789703-32-7
Mol.F.: C24H29N5O7S2
Mol.Wt.: 563.6
Status: Custom Synthesis

Amoxicillin Impurity 1

(?R)-?-Amino-4-hydroxybenzeneacetamide; (R)-?-Amino-4-hydroxybenzeneacetamide; 4-Hydroxy-(R)-phenylglycinamide
CAT No: VS-A062033
CAS No: 54397-23-8
Mol.F.: C8H10N2O2?
Mol.Wt.: 166.2
Status: Custom Synthesis

Amoxicillin Impurity 2

(2S,4S)-2-((R)-1-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-methoxy-2-oxoethyl)-5,5-dimethylthiazolidine-4-carboxylic acid
CAT No: VS-A062034
CAS No: 185802-22-6
Mol.F.: C17H23N3O6S
Mol.Wt.: 397.5
Status: Custom Synthesis

Amoxicillin Impurity 3

(2S,4S)-2-((R)-1-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-(((R)-2-((((2S,4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)methyl)amino)-1-(4-hydroxyphenyl)-2-oxoethyl)amino)-2-oxoethyl)-5,5-dimethylthiazolidine-4-carboxylic acid
CAT No: VS-A062035
CAS No: 297175-66-7
Mol.F.: C31H40N6O9S2
Mol.Wt.: 704.8
Status: Custom Synthesis

Amoxicillin Impurity 4

Sodium 2-((2-amino-2-(4-hydroxyphenyl)acetamido)(carboxy)methyl)-5,5-dimethylthiazolidine-4-carboxylate
CAT No: VS-A062036
CAS No: 68728-47-2
Mol.F.: C16H20N3O6S : Na
Mol.Wt.: 382.4 : 23.0
Status: Custom Synthesis

Amoxicillin Impurity M

(2S,5R,6R)-6-(2-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-((4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
CAT No: VS-A062020
CAS No: N/A
Mol.F.: C24H31N5O8S2?
Mol.Wt.: ?581.7
Status: Custom Synthesis

Amoxicillin Open Ring Decarboxylated Dimer Disodium salt

(2R,4S)-2-((1S)-1-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-2-(((1R)-2-((((2R)-4-carboxy-5,5-dimethylthiazolidin-2-yl)methyl)amino)-1-(4-hydroxyphenyl)-2-oxoethyl)amino)-2-oxoethyl)-5,5-dimethylthiazolidine-4-carboxylic acid, Disodium salt
CAT No: VS-A062023
CAS No: N/A
Mol.F.: C31H40N6O9S2 . 2Na
Mol.Wt.: 704.8 . 2(23.0)
Status: Custom Synthesis

Amoxicillin Open RIng Trimer Impurity

(2R,2'R,2''R,4S,4'S,4''S)-2,2',2''-((1R,4R,10R,16R)-16-Amino-1-carboxy-4,10,16-tris(4-hydroxyphenyl)-3,6,9,12,15-pentaoxo-2,5,8,11,14-pentaazahexadecane-1,7,13-triyl)tris(5,5-dimethylthiazolidine-4-carboxylic acid)
CAT No: VS-A062030
CAS No: 210289-73-9
Mol.F.: C48H59N9O16S3
Mol.Wt.: 1114.2
Status: Custom Synthesis

Amoxicillin Open RIng Trimer Impurity sodium salt

sodium (2R,2'R,2''R,4S,4'S,4''S)-2,2',2''-((1R,4R,7R,10R,13R,16R)-16-amino-1-carboxylato-4,10,16-tris(4-hydroxyphenyl)-3,6,9,12,15-pentaoxo-2,5,8,11,14-pentaazahexadecane-1,7,13-triyl)tris(5,5-dimethylthiazolidine-4-carboxylate)
CAT No: VS-A062024
CAS No: N/A
Mol.F.: C48H59N9O16S3 . 4Na
Mol.Wt.: 1114.2 . 4(23.0)
Status: Custom Synthesis

Amoxicillin related compound J (Mixture of amoxicillin and open ring dimer)

(2S,5R,6R)-6-((2R)-2-(2-((R)-2-Amino-2-(4-hydroxyphenyl)acetamido)-2-((4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)acetamido)-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid compound with (2S,5R,6R)-6-((
CAT No: VS-A062038
CAS No: NA
Mol.F.: C16H19N3O5S3H2O+C32H38N6O10S2
Mol.Wt.: 1150.26
Status: Custom Synthesis

Amoxicillin Sodium

(2S,5R,6R)-6-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid sodium(as per EP): Sodium (2S,5R,6R)-6-[[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabic
CAT No: VS-A062001
CAS No: 34642-77-8
Mol.F.: C16H19N3O5S : Na
Mol.Wt.: 365.4 : 23.0
Status: Custom Synthesis

Amoxicillin Sulfoxide

(2S,5R,6R)-6-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid 4-oxide
CAT No: VS-A062003
CAS No: 2485704-40-1
Mol.F.: C16H19N3O6S
Mol.Wt.: 381.4
Status: Custom Synthesis

Amoxicillin Trihydrate

(2S,5R,6R)-6-[[(2R)-2-Amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid trihydrate ( as per EP) ; (2S,5R,6R)-6-[(R)-(?)-2-Amino-2-(p-hydroxyphenyl)acetamido]-3,3-dimethyl-7-oxo-4-thia-1-azabicycl
CAT No: VS-A062002
CAS No: 61336-70-7
Mol.F.: C16H19N3O5S : 3H2O
Mol.Wt.: 365.4 : 3(18.0)
Status: Custom Synthesis

Amoxicillin Trimer

(2S,5R,6R)-6-((2R)-2-((2S,5R,6R)-6-((2R)-2-((2S,6R)-6-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxamido)-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carbo
CAT No: VS-A062026
CAS No: N/A
Mol.F.: C48H53N9O13S3
Mol.Wt.: 1060.2
Status: Custom Synthesis

Amoxicillin Trimer Impurity

(2R,2'R,4S,4'S)-2,2'-((1R,4S,7R,10R)-1-amino-14-(((2S,5R,6R)-2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl)amino)-1,7,13-tris(4-hydroxyphenyl)-2,5,8,11,14-pentaoxo-3,6,9,12-tetraazatetradecane-4,10-diyl)bis(5,5-dimethylthiazolidine-4-
CAT No: VS-A062027
CAS No: 174391-69-6
Mol.F.: C48H57N9O15S3
Mol.Wt.: 1096.2
Status: Custom Synthesis

Amoxicillin Trimer Impurity (Na)

(2R,2'R,4S,4'S)-2,2'-((1R,4S,7R,10R)-1-amino-14-(((2S,5R,6R)-2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl)amino)-1,7,13-tris(4-hydroxyphenyl)-2,5,8,11,14-pentaoxo-3,6,9,12-tetraazatetradecane-4,10-diyl)bis(5,5-dimethylthiazolidine-4-
CAT No: VS-A062022
CAS No: 94703-34-1
Mol.F.: C48H57N9O15S3?. 3Na
Mol.Wt.: ?1096.2 . 3(23.0)
Status: Custom Synthesis

N-(Penicillan-6-yl) Open Ring Amoxicillinamide Disodium Salt

(2S,5R,6R)-6-((2R)-2-(2-Amino-2-(4-hydroxyphenyl)acetamido)-2-((2R,4S)-4-carboxy-5,5-dimethylthiazolidin-2-yl)acetamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid disodium salt
CAT No: VS-A062039
CAS No: NA
Mol.F.: C24H29N5Na2O8S2
Mol.Wt.: 625.63
Status: Custom Synthesis

N-Pivaloyl Amoxicillin

4-?Thia-?1-?azabicyclo[3.2.0]?heptane-?2-?carboxylic acid, 6-?[[(2R)?-?2-?[(2,?2-?dimethyl-?1-?oxopropyl)?amino]?-?2-?(4-?hydroxyphenyl)?acetyl]?amino]?-?3,?3-?dimethyl-?7-?oxo-?, (2S,?5R,?6R)?-
CAT No: VS-A062021
CAS No: 1313237-94-3
Mol.F.: C21H27N3O6S?
Mol.Wt.: ?449.5
Status: Custom Synthesis

P-Hydroxyphenylglycine methyl ester

Methyl (S)-2-amino-2-(4-hydroxyphenyl)acetate
CAT No: VS-A062028
CAS No: 26531-82-8
Mol.F.: C9H11NO3
Mol.Wt.: 181.2
Status: Custom Synthesis

P-Hydroxyphenylglycine methyl ester HCl

Methyl (S)-2-amino-2-(4-hydroxyphenyl)acetate hydrochloride (1:1)
CAT No: VS-A062031
CAS No: 127369-30-6
Mol.F.: C9H11NO3 : HCl
Mol.Wt.: 181.2 : 36.5
Status: Custom Synthesis

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