KARPSCHEM LABORATORIES

Main products: Adenosine,Albendazole,Albendazole EP Impurity A,Allopurinol,Amoxicillin

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Company Name:KARPSCHEM LABORATORIES PVT. LTD.
Tel:+917249203006
Email:info@karpschem.in
WebSite:www.karpschem.in
Product Total:821
CB Index:58
Nationality:India
      KarpsChem is an independent research driven company specialized in the custom synthesis of pharmacopeia & non-pharmacopeia reference standards, drug gluconorides, drug metabolites, Isotope labelled reference standards and focused compound libraries. As a research-driven organization, we have developed novel processes to make niche products required to pharmaceutical companies globally at various platform. We understand the industry research needs thoroughly and have earned reputation for being most reliable innovator of pharmaceutical reference standards worldwide. Team having expertise of synthesis for undertaking CRAMs and CRO projects from Pharmaceutical, Agriculture and Veterinary industries. Variety of impurities like Genotoxic, Neurotoxic impurities required for agencies like USFDA, MHRDA etc,are available.
Product Name MF CAS Details
Phenylephrine EP Impurity D Phenylephrine USP Related Compound D ; (1R)-2-(benzylmethylamino)-1-(3-hydroxyphenyl)ethanol ; benzylphenylephrine C16H19NO2 1367567-95-0
Metoprolol EP Impurity O Metoprolol USP Related Compound D ; 1,1-[(1- Methylethyl)imino]bis[3-[4-(2-methoxyethyl)phenoxy] propan- 2-ol] Hydrochloride C27H42ClNO6 1486464-40-7
4-(4-Chlorophenyl)-1H-2,3-benzoxazin-1-one C14H8ClNO2 2224-83-1
Thiamazole EP Impurity B 1-Methyl-1H-imidazole; N-Methylimidazole C4H6N2 616-47-7
Apixaban chloro impurity 1-(4-chlorophenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]- 4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylic Acid Amide C24H22ClN5O3 2029205-64-7
Alprazolam Impurity E Prazepam Imp. C (EP), Clorazepate Imp. A (EP), , 2-Amino-5- chloro benzophenone C13H10ClNO 719-59-5
Brexpiprazole Impurity 10 2,7-bis(4-chlorobutoxy)quinoline C17H21Cl2NO2 2060027-95-2
Brexpiprazole Impurity 17 7-(4-(4-(benzo[b]thiophen-4-yl)piperazin-1-yl)butoxy)-1- (4-((2-oxo-1,2-dihydroquinolin-7-yl)oxy)butyl)quinolin-2(1H)- one C38H40N4O4S 2094559-58-5
Lansoprazole EP Impurity D 1H-Benzimidazol-2-ol ; 2-Hydroxybenzimidazole C7H6N2O 615-16-7
Rabeprazole EP Impurity K Lansoprazole EP Impurity D ; 2-Hydroxybenzimidazole C7H6N2O 615-16-7
Teriflunomide Impurity12 Leflunomide ; 5-Methyl-N-[4-(trifluoromethyl)phenyl]isoxazole- 4-carboxamide C12H9F3N2O2 75706-12-6
Leflunomide 5-methyl-N-(4-(trifluoromethyl)phenyl)isoxazole-4-carboxamide C12H9F3N2O2 75706-12-6
Clonidine EP Impurity A 1-Acetylimidazolidin-2-one C5H8N2O2 5391-39-9
Piroxicam 4-hydroxy-2-methyl-N-(pyridin-2-yl)-2H-benzo[e][1,2]thiazine-3- carboxamide 1,1-dioxide C15H13N3O4S 36322-90-4
Fenticonazole Nitrate EP Impurity D 3-(2-(2,4-dichlorophenyl)-2-hydroxyethyl)-1-(4- (phenylthio)benzyl)-1H-imidazol-3-ium nitrate C24H21Cl2N3O4S 1313397-05-5
Amoxicillin EP Impurity A Amoxicillin Related Compound A ; 6-APA ; (+)-6- Aminopenicillanic acid ;(2S,5R,6R)-6-Amino-3,3-dimethyl-7-oxo- 4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid C8H12N2O3S 551-16-6
Amoxicillin EP Impurity A Amoxicillin Related Compound A ; 6-APA ; (+)-6- Aminopenicillanic acid ;(2S,5R,6R)-6-Amino-3,3-dimethyl-7-oxo- 4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid C8H12N2O3S 551-16-6
6-Aminopenicillanic Acid (2S,5R,6R)-6-amino-3,3-dimethyl-7-oxo-4-thia-1- azabicyclo[3.2.0]heptane-2-carboxylic acid C8H12N2O3S 551-16-6
Aripiprazole EP Impurity B 1-(2,3-dichlorophenyl)piperazine ; 4-(2,3-Dichlorophenyl)-1- piperazinebutanol Hydrochloride C10H13Cl3N2 119532-26-2
Paracetamol N-(4-hydroxyphenyl)acetamide C8H9NO2 103-90-2
Losartan Potassium 2-Butyl-4-chloro-1-[[2'-(1H-tetrazol-5-yl)[1,1'-biphenyl]-4- yl]methyl]-1H-imidazole-5-methanol monopotassium salt C22H23ClKN6O 124750-99-8
Fexofenadine EP Impurity D methyl -2-(4-(1-hydroxy-4-(4-(hydroxydiphenylmethyl)piperidin- 1-yl) butyl)phenyl)-2-methylpropanoate C33H41NO4 154825-96-4
Mesalazine EP Impurity Q 2-chloro-3-nitrobenzoic acid. ; Mesalamine EP Impurity Q C7H4ClNO4 3970-35-2
Enalaprili Maleate ((S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl)-L-alanyl-L-proline C24H32N2O9 76095-16-4
Rabeprazole 2-Chloromethyl Impurity 2-Chloromethyl-3-methyl-4-(3-methoxypropoxy)pyridine hydrochloride C11H17Cl2NO2 153259-31-5
Metamizole EP Impurity D 4-(dimethylamino)-1,5-dimethyl-2-phenyl-1,2-dihydro-3H- pyrazol-3-one ; 4-Dimethylamino Antipyrine C13H17N3O 58-15-1
Mesalazine 5-Amino-2-hydroxybenzoic acid. ; Mesalamine C7H7NO3 89-57-6
Mesalazine EP Impurity O 4-aminobenzenesulfonic acid (sulfanilic acid).; Mesalamine EP Impurity O C6H7NO3S 121-57-3
Glimepiride EP Impurity C Glimepiride Ester C18H23N3O6S 119018-30-3
Haloperidol EP Impurity D Haloperidol USP Related Compound A C32H36Cl2N2O3 67987-08-0
Dabigatran Impurity 8 Hexyl (imino(4-(((1-methyl-5-((3-oxo-3-(pyridin-2- ylamino)propyl)(pyridin-2-yl)carbamoyl)-1H-benzo[d]imidazol-2- thyl)amino)phenyl)methyl)carbamate C37H41N9O4 1637238-96-0
Mesalazine EP Impurity H 2-hydroxybenzoic acid (salicylic acid).; Mesalamine EP Impurity H C7H6O3 69-72-7
Dextromethorphan (9α,13α,14α)-3-Methoxy-17-methylmorphinan3-Methoxy-17 -methyl-9α,13α,14α-morphinan; (+)-3-Methoxy-17- methylmorphinan C18H25NO 125-71-3
Roxithromycin C41H76N2O15 80214-83-1
Haloperidol Impurity 9 4-(4-chlorophenyl)-4-hydroxypiperidine ; Chlorophenyl hydroxypiperidine C11H14ClNO 39512-49-7
Loperamide EP Impurity C 4-(4-chlorophenyl)piperidin-4-ol C11H14ClNO 39512-49-7
Guaifenesin Ranolazine Related Compound 2;3-(2- methoxyphenoxy)propane-1,2-diol C10H14O4 93-14-1
Ranolazine Related Compound 2 Guaifenesin ; 3-(2-methoxyphenoxy)propane-1,2-diol C10H14O4 93-14-1
Lisinopril EP Impurity B 4-methylbenzenesulfonic acid C7H8O3S 104-15-4
Lansoprazole EP Impurity B Lansoprazole USP Related Compound A ; Lansoprazole Sulfone C16H14F3N3O3S 131926-99-3
Lacosamide Impurity C 1,3-Dibenzyl-urea; N,N'-Bis(phenylmethyl)urea C15H16N2O 1466-67-7
Diltiazem EP Impurity F Desacetyl Diltiazem C20H24N2O3S 42399-40-6
Teriflunomide Meta isomer
Pantoprazole Sulfone N-Oxide 2-(((5-(difluoromethoxy)-1H-benzo[d]imidazol-2- yl)sulfonyl)methyl)-3,4-dimethoxypyridine 1-oxide C16H15F2N3O6S 953787-55-8
Atropine EP Impurity A Apoatropine, 8-methyl-8-azabicyclo[3.2.1]octan-3-yl 2- phenylacrylate C17H21NO2 500-55-0
Busulfan 1,4-Butanediol-dimethanesulfonate Esters; Busulphan C6H14O6S2 55-98-1
Lacosamide EP Impurity G N-benzyl acetamideLacosamide, N-(Phenylmethyl)-acetamide C9H11NO 588-46-5
Azilsartan 1-[[2’-(2,5-Dihydro-5-oxo-1,2,4-oxadiazol-3-yl) [1,1’-biphenyl]-4-yl]methyl]-2-ethoxy-1H-benzimidazole-7- carboxylic Acid C25H20N4O5 147403-03-0
Irbesartan Dibromomethyl Impurity 4'-(Dibromomethyl)biphenyl-2-carbonitrile C14H9Br2N 209911-63-7
Tirofiban Impurity A L-N-Butylsulfonyl-p-hydroxyphenylalanine, C13H19NO5S 149490-60-8
Oxcarbazepine EP Impurity C Oxcarbazepine Related Compound E; 5,11-dihydro-10H-dibenzo[b,f]azepin-10-one C14H11NO 21737-58-6
Atorvastatin Acid t-Butyl Ester (3R,5R)-7-[3-(Phenylcarbamoyl)-5-(4-fluorophenyl)-2isopropyl-4- phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid t-butyl ester C37H43FN2O5 134395-00-9
Chlortalidone EP impurity G Chlorthalidone Dichloro Impurity ; (3RS)-3-(3,4-Dichlorophenyl)- 3hydroxy-2,3-dihydro-1H-isoindol-1-one C14H9Cl2NO2 16289-13-7
Pioglitazone Aldehyde Impurity Pioglitazone Benzaldehyde Impurity C16H17NO2 114393-97-4
Estradiol Related Compound B 6,7-Dehydro Estradiol C18H22O2 7291-41-0
Lidocaine EP Impurity C N (2,6-Dimethylphenyl)acetamide C10H13NO 2198-53-0
Albendazole EP Impurity C Albendazole Sulfone ; Methyl [5-(propylsulphonyl) -1Hbenzimidazol-2-yl]carbamate C12H15N3O4S 75184-71-3
Buspirone EP Impurity A Buspirone USP RC A; 2-(Piperazin-1-yl)pyrimidine C8H12N4 20980-22-7
Mesalazine EP Impurity K aniline hydrochloride C6H8ClN 142-04-1
Diltiazem EP Impurity B (2S,3S)-2-(4-Methoxyphenyl)-4-oxo-2,3,4,5-tetrahydro- 1,5-benzothiazepin-3-yl acetate C18H17NO4S 87447-47-0
Metoprolol EP Impurity C Metoprolol USP Related Compound C ; 4-[(2RS)-2-Hydroxy-3-[(1- methylethyl)amino]propoxy]benzaldehyde C13H19NO3 29122-74-5
Bisoprolol EP Impurity L 4-[((2RS)-2-Hydroxy-3-(isopropylamino)- propyl)oxy]benzaldehyde C13H19NO3 29122-74-5
Loratadine N-Oxide 4-(8-Chloro-5,6-dihydro-1-oxido-11H-benzo[5,6]cyclohepta[1,2- b]pyridin-11-ylidene)-1-piperidinecarboxylic acid ethyl ester C22H23ClN2O3 165739-62-8
Meloxicam 4-hydroxy-2-methyl-N-(5-methylthiazol-2-yl)-2H- benzo[e][1,2]thiazine- 3-carboxamide 1,1-dioxide C14H13N3O4S2 71125-38-7
Estradiol (8R,9S,13S,14S,17S)-13-methyl-7,8,9,11,12,13,14,15,16,17 -decahydro-6H-cyclopenta[a]phenanthrene-3,17-diol C18H24O2 50-28-2
Diclofenac EP Impurity C [2-[(2,6-Dichlorophenyl)amino]phenyl]methanol C13H11Cl2NO 27204-57-5
Febuxostat Ethyl Ester Ethyl 2-(3-cyano-4-isobutoxyphenyl)-4-methylthiazole-5- carboxylate C18H20N2O3S 160844-75-7
Telmisartan EP Impurity C Telmisartan t-Butyl Ester C37H38N4O2 144702-26-1
Pioglitazone EP impurity C Pioglitazone USP RC C ; N-Alkyl Pioglitazone C28H31N3O3S 952188-00-0
Clarithromycin 6-O-Methylerythromycin; 6-O-Methylerythromycin A C38H69NO13 81103-11-9
Isosorbide Mononitrate EP Impurity A Isosorbide Dinitrate C6H8N2O8 87-33-2
Tadalafil (6R,12aR)-6-(1,3-Benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2- methylpyrazino[1’,2’:1,6]pyrido[3,4-b]indole-1,4-dione; Cialis; C22H19N3O4 171596-29-5
Lurasidone (3aR,4S,7R,7aS)-2-(((1R,2R)-2-((4-(benzo[d]isothiazol-3- yl)piperazin-1-yl)methyl) cyclohexyl)methyl)hexahydro-1H-4,7-methanoisoindole-1,3(2H)- dione C28H36N4O2S 367514-87-2
DORZOLAMIDE IMPURITY B (4RS,6SR)-4-(Ethylamino)-6-methyl-5,6-dihydro-4H -thieno[2, 3-b]thiopyran-2-sulfonamide 7,7-dioxide Hcl C10H17ClN2O4S3 120279-37-0
Olmesartan Anhydro Acid Olmesartan Methylvinyl Acid ; Olmesartan Olefinic Acid C24H24N6O2 172875-98-8
Pregabalin (S)-3-(Aminomethyl)-5-methylhexanoic acid C8H17NO2 148553-50-8
Alfuzosin EP Impurity C (RS)-N-[3-[(4-Amino-6,7-dimethoxyquinazolin-2-yl)amino]propyl]-N-methyltetrahydrofuran-2-carboxamide hydrochloride C19H28ClN5O4 72104-34-8
Celecoxib EP Impurity A USP Related Compound A ; Celecoxib 3-Methyl Analog;4-[5-(3- Methylphenyl)-3-trifluoromethyl-1H-pyrazol-1- yl]benzenesulfonamide C17H14F3N3O2S 170570-01-1
Ivabradine Impurity 1 3-(3-chloropropyl)-7,8-dimethoxy-1,3,4,5-tetrahydro-2H- benzo[d]azepin-2-one C15H20ClNO3 85175-65-1
Telmisartan EP Impurity F Telmisartan Amide C33H31N5O 915124-86-6
Vildagliptin Dimer Impurity (2S,2'S)-1,1'-(2,2'-(((1r,3R,5R,7S)-3-hydroxyadamantan-1- yl)azanediyl)bis(acetyl))bis(pyrrolidine-2-carbonitrile) C24H33N5O3 1036959-23-5
Vildagliptin Chloroacetyl Amide (R)-Isomer (R)-1-(2-Chloroacetyl)pyrrolidine-2-carboxamide C7H11ClN2O2 1211679-98-9
Chlortalidone EP impurity E Chlorthalidone Deshydroxy Impurity ; 2-Chloro-5-(3-oxo-1- isoindolinyl)benzenesulfonamide C14H11ClN2O3S 82875-49-8
Desethyl Dabigatran Etexilate Carboxamide C32H38N8O4 1580491-16-2
Celecoxib 2-Methyl Analog 4-[5-(2-Methylphenyl)-3-trifluoromethyl-1H-pyrazol-1- yl]benzenesulfonamide C17H14F3N3O2S 170569-99-0
Chlortalidone EP impurity D Chlorthalidone Ethyl Ether ; O-Ethyl Chlorthalidone ; 2-Chloro- 5[(1RS)-1-ethoxy-3-oxo-2,3-dihydro-1H-isoindol-1-yl]benzene sulfonamide C16H15ClN2O4S 1369995-36-7
Carbamazepine EP Impurity B 9-Methylacridine C14H11N 611-64-3
(R)-1-[(4-Chlorophenyl)phenylmethyl]piperazine (-)-1-[(4-Chlorophenyl)phenylmethyl]piperazine; (R)-1-(p- Chlorobenzhydryl)piperazine; C17H19ClN2 300543-56-0
Chlorobenzhydryl Piperazine (R)-1-((4-chlorophenyl)(phenyl)methyl)piperazine C17H19ClN2 300543-56-0
Phenytoin Sodium 5,5-diphenylimidazolidine-2,4-dione C15H13N2NaO2 630-93-3
Decitabine Related Compound C (2R,3S,5S)-5-(4-amino-2-oxo-1,3,5-triazin-1(2H)-yl)-2-(((4- chlorobenzoyl)oxy)methyl)tetrahydrofuran-3-yl 4-chlorobenzo C22H18Cl2N4O6 1140891-02-6
Brexpiprazole S-Oxide 7-[4-[4-(1-Oxidobenzo[b]thien-4-yl)-1-piperazinyl]butoxy]-2(1H)- quinolinone C25H27N3O3S 1191900-51-2
Diltiazem EP Impurity E (2S,3S)-3-Hydroxy-2-(4-methoxyphenyl)-2,3- dihydro-1,5-benzothiazepin-4(5H)-one C16H15NO3S 42399-49-5
Olmesartan EP Impurity A Olmesartan Acid C24H26N6O3 144689-24-7
4,5-Dehydro Apixaban 1-(4-Methoxyphenyl)-7-oxo-6-(4-(2-oxopiperidin-1-yl)phenyl)- 6,7-dihydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide C25H23N5O4 1074549-89-5
Nabumetone 4-(6-methoxynaphthalen-2-yl)butan-2-one C15H16O2 42924-53-8
Leflunomide EP Impurity A Leflunomide USP RC A ; 4-(trifluoromethyl)aniline C7H6F3N 455-14-1
Levodopa (S)-2-amino-3-(3,4-dihydroxyphenyl)propanoic acid C9H11NO4 59-92-7
Meloxicam EP Impurity A Meloxicam USP Related Compound A ; ethyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide C12H13NO5S 24683-26-9
Piroxicam EP Impurity K Ethyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide C12H13NO5S 24683-26-9
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