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Company Name:KARPSCHEM LABORATORIES PVT. LTD.
Tel:+91 7249203006;+91-9371639228
Email:info@karpschem.in
WebSite:www.karpschem.in
Product Total:829
CB Index:58
Nationality:India
      we are specialty chemicals and intermediates manufacturers, also can do CRO.
Product Name MF CAS Details
Atenolol 2-[4-[(2RS)-2-hydroxy-3-[(1-methylethyl)amino] propoxy]phenyl]acetamide C14H22N2O3 29122-68-7
Fenticonazole Nitrate EP Impurity A 1-(2,4-dichlorophenyl)-2-(1H-imidazol-1-yl)ethan-1-ol C11H10Cl2N2O 24155-42-8
Vildagliptin Chloroacetyl Nitrile (S)-Isomer (2S)-1-(Chloroacetyl)-2-Pyrrolidinecarbonitrile ; Vildagliptin Impurity 14 C7H9ClN2O 207557-35-5
Brexpiprazole Impurity 13 4-Bromo benzo[b]thiophene C8H5BrS 5118-13-8
Pregabalin Impurity 5 3-(2-amino-2-oxoethyl)-5-methylhexanoic acid C9H17NO3 181289-15-6
Quetiapine EP Impurity B Quetiapine USP Related Compound B ; Dibenzo[b,f][1,4]thiazepine-11-yl-piperazine dihydrochloride C17H18ClN3S 111974-74-4
Lenalidomide 3-(4-Amino-1,3-dihydro-1-oxo-2H-isoindol-2-yl)-2,6- piperidinedione C13H13N3O3 191732-72-6
Zonisamide Related Compound A (1,2-benzisoxazole-3-methanesulfonic acid sodium salt C8H8NNaO4S 73101-64-1
Bumetanide EP Impurity C butyl 3-(butylamino)-4-phenoxy-5-sulfamoylbenzoate C21H28N2O5S 32643-00-8
Bupivacaine HCl (2RS)-1-Butyl-N-(2,6-dimethylphenyl)piperidine-2-carboxamide hydrochloride C18H28N2O.ClH 18010-40-7
4-phenyl thio benzyl chloride (4-(chloromethyl)phenyl)(phenyl)sulfane C13H11ClS 1208-87-3
Metolazone EP Impurity E Metolazone USP RC B ; Metolazone benzamide analog ; C14H14ClN3O3S 23380-54-3
Lacosamide (2R)-2-(Acetylamino)-3-methoxy-N- (phenylmethyl)propanamide C13H18N2O3 175481-36-4
Venlafaxine EP Impurity D Venlafaxine USP Related Compound A C16H25NO2 149289-30-5
Pioglitazone N-Oxide 5-[[4-[2-(5-Ethyl-2-pyridinyl]ethoxy]phenyl]methyl]-2,4- thiazolidinedione N-oxide C19H20N2O4S 145350-09-0
Aspartame EP Impurity C Phenylalanine C9H11NO2 150-30-1
3-Methylacetophenone C9H10O 585-74-0
Irbesartan Impurity C 2-[4-(Hydroxymethyl)phenyl]benzonitrile; 4-(Hydroxymethyl)-2'- cyanobiphenyl C14H11NO 154709-19-0
Ranolazine Related Compound 4 1-(2-methoxyphenoxy)-2,3- epoxy propane C10H12O3 2210-74-4
Guaifenesin Impurity 1 2-((2-methoxyphenoxy)methyl)oxirane C10H12O3 2210-74-4
Ranolazine Related Compound A 2-[(2-Methoxyphenoxy)methyl]oxirane C10H12O3 2210-74-4
β-Carotene 1,3,3-Trimethyl-2-[3,7,12,16-tetramethyl-18-(2,6,6- trimethylcyclohex-1-en-1-yl) octadeca-1,3,5,7,9,11,13,15,17- nonaen-1-yl]cyclohex-1-ene C40H56 7235-40-7
Celecoxib Related Compound 4 4,4,4-trifluoro-1-p-tolylbutane-1,3-dione C11H9F3O2 720-94-5
Olmesartan Imidazole Ethyl Ester Impurity Ethyl 4-(1-hydroxy-1-methylethyl)-2-propyl-imidazole-5- carboxylate C12H20N2O3 144689-93-0
Venlafaxine EP Impurity E (5RS)-5-(4-methoxyphenyl)-3-methyl-1-oxa-3- azaspiro[5.5]undecane C17H25NO2 93413-70-8
Donepezil Benzyl Bromide 1,1-Dibenzyl-4-[(5,6-dimethoxy-1-oxoindan-2-yl) methyl]piperidinium bromide C31H36BrNO3 844694-85-5
2-Phenyl-1,3-propanediol C9H12O2 1570-95-2
Celecoxib Impurity 7 4,4,4-trifluoro-1-(o-tolyl)butane-1,3-dione C11H9F3O2 163266-02-2
Losartan EP Impurity D Losartan USP RC A ; 2-Butyl-4-chloro-1H-imidazole-5- carbaldehyde C8H11ClN2O 83857-96-9
Metoprolol EP Impurity A Metoprolol USP Related Compound A C14H23NO3 109632-08-8
Metoprolol USP Related Compound B (+/-)1-Chloro-2-hydroxy-3-[4-(2-methoxyethyl)phenoxy]- propane C12H17ClO3 56718-76-4
Methyltestosterone 17-Hydroxy-17-methyl-3-keto-androstene-4 C20H30O2 58-18-4
Progesterone C21H30O2 57-83-0
2-Butyl Benzofuran C12H14O 4265-27-4
Atorvastatin calcium salt Calcium (3R,5R)-7-[2-(4-fluorophenyl)-5-(1-methylethyl)-3- phenyl-4-(phenylcarbamoyl)-1H-pyrrol-1-yl]- 3,5dihydroxyheptanoate C33H35FN2O5 134523-00-5
Fexofenadine EP Impurity A Fexofenadine USP related compound A C32H37NO4 76811-98-8
Lansoprazole Sulfone N-Oxide 2-[[[3-Methyl-1-oxido-4-(2,2,2-trifluoroethoxy)-2- pyridinyl]methyl]sulfonyl]-1H-benzimidazole C16H14F3N3O4S 953787-54-7
Leflunomide EP Impurity C Leflunomide USP RC C ; 5-methyl-N-(3- (trifluoromethyl)phenyl)isoxazole-4-carboxamide C12H9F3N2O2 61643-23-0
Prucalopride Succinate 4-amino-5-chloro-N-(1-(3-methoxypropyl)piperidin-4-yl)-2,3 -dihydrobenzofuran-7-carboxamide succinate C22H32ClN3O7 179474-85-2
Valsartan EP Impurity C Valsartan related compound B ; Valsartan N-Butyryl Analog C23H27N5O3 952652-79-8
Aripiprazole Impurity 6 7-Hydroxyquinoline-(1H)-2-one , 7-Hydroxy-2(1H)-quinolinone C10H12Cl2N2 63386-61-8
Felbamate Related Compound B phenethyl carbamate C9H11NO2 6326-19-8
Irbesartan Cyano Impurity 4'-[(2-Butyl-4-oxo-1,3-diazaspiro[4.4]non-1-en-3- yl)methyl]biphenyl-2-carbonitrile C25H27N3O 138401-24-8
Celecoxib Impurity 5 (E)-4-(2-(1-p-tolylethylidene)hydrazinyl)benzenesulfonamide C15H17N3O2S 1061214-06-9
Desloratadine N-Formyl Impurity Desloratadine USP RC F; Desloratadine N-Formyl Impurity C20H19ClN2O 117810-61-4
Olmesartan Impurity 6 ethyl 4-acetyl-2-propyl-1H-imidazole-5-carboxylate C11H16N2O3 144690-07-3
Prasugrel EP Impurity G Prasugrel Diketone ; 1-cyclopropyl-2-(2-fluorophenyl)ethane- 1,2-dione C11H9FO2 1391054-37-7
Telmisartan 2-(4-{[4-Methyl-6-(1-methyl-1H-1,3-benzodiazol-2-yl)-2-propyl- 1H-1,3 -benzodiazol-1-yl] methyl}phenyl)benzoic acid C33H30N4O2 144701-48-4
Atorvastatin EP Impurity F (3R,5R)-7-[[(3R,5R)-7-[2-(4-fluorophenyl)-5-(1-methylethyl) -3-phenyl-4-(phenylcarbamoyl)-1H-pyrrol-1-yl]-3,5- dihydroxyheptanoyl]amino]-3,5-dihydroxyheptanoic acid C40H48FN3O8 887196-24-9
Olmesartan Medoxomil Ethyl Methyl Analog 4-(1-Hydroxy-1-methylpropyl)-2-propyl-1-[[2’-(2H-tetrazol-5- yl)[1,1’-biphenyl]-4-yl]methyl]-1H-imidazole-5-carboxylic Acid (5-Methyl-2-oxo-1,3-dioxol-4-yl)methyl Ester C30H32N6O6 1378863-74-1
Sitagliptin Impurity 18 tert-butyl (R)-(4-oxo-4-(3-(trifluoromethyl)-5,6-dihydro- [1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl)-1-(2,4,5- trifluorophenyl)butan-2-yl)carbamate C21H23F6N5O3 486460-23-5
Olmesartan EP Impurity D N2-Trityl Olmesartan Medoxomil C48H44N6O6 1020157-01-0
Cetirizine EP Impurity Ethyl Ester (RS)-2-[4-[(4-Chlorophenyl)phenylmethyl] piperazin-1-yl]acetic acid ethyl ester C21H25ClN2O2 19178-83-7
Alfuzosin EP Impurity F 6,7-dimethoxy-N2,N2-dimethylquinazoline-2,4-diamine ; 4- Amino-2-(dimethylamino)-6,7-dimethoxy-quinazoline C12H16N4O2 19216-53-6
Memantine Related Compound A (1r,3r,5s,7s)-1,3-dimethyladamantane C12H20 702-79-4
Brexpiprazole Impurity 5 7,7'-(butane-1,4-diylbis(oxy))bis(quinolin-2(1H)-one) C22H20N2O4 2116542-19-7
Progesterone EP Impurity B C21H32O2 145-14-2
Aspartame (S)-3-Amino-4-(((S)-1-methoxy-1-oxo-3-phenylpropan-2- yl)amino)-4-oxobutanoic acid C14H18N2O5 22839-47-0
Lurasidone DP4- IMPURITY Lurasidone Sulfoxide C28H36N4O3S 1809325-45-8
Pirfenidone EP Impurity C phenol C6H6O 108-95-2
Olmesartan Medoxomil Impurity 5 (5-Methyl-2-oxo-1,3-dioxol-4-yl)methyl Chloride; 4- Chloromethyl-5-methyl-2-oxo-1,3-dioxole C5H5ClO3 80841-78-7
Hydroxychloroquine Sulfate 2-[[4-[(7-Chloro-4-quinolinyl)amino]pentyl]ethylamino]ethanol Sulfate C18H28ClN3O5S 747-36-4
Cetirizine EP Impurity G Cetirizine Ethanol Impurity ; (R)-2-(4-((4- hlorophenyl)(phenyl)methyl)piperazin-1-yl)ethan-1-ol Dihydrochloride C19H25Cl3N2O 164726-80-1
Irbesartan 2-Butyl-3-[p-(o-1H-tetrazol-5-ylphenyl)benzyl]-1,3- diazaspiro[4.4]non-1-en-4-one C25H28N6O 138402-11-6
Loratadine EP Impurity B Loratadine USP Related Compound C ; 8-Chloro-5,6-dihydro- 11H-benzo[5.6] cyclohepta[1,2-b]pyridin-11-one C14H10ClNO 31251-41-9
Nitroso-N-methyl-4-aminobutyric acid (NMBA) 4-(Methylnitrosoamino)butanoic Acid; N-Methyl-N-(3- carboxypropyl)nitrosamine C5H10N2O3 61445-55-4
Dextromethorphan Impurity A (+)-3-Methoxy morphinan; (4bR,8aR,9R)-3-Methoxy- 6,7,8,8a,9,10-hexahydro-5H-9,4b- (epiminoethano)phenanthrene C17H23NO 1531-25-5
Chlordiazepoxide EP Impurity A Chlordiazepoxide Related Compound A (7-Chloro-1,3-dihydro-5- phenyl-2H-1,4-benzodiazepin-2-one 4-Oxide) C15H11ClN2O2 963-39-3
Diclofenac EP Impurity A Diclofenac USP Related Compound A;Aceclofenac EP Impurity I ; Diclofenac Amide C14H9Cl2NO 15362-40-0
Clonidine EP Impurity B Clonidine Related Compound A ; 1-(2-((2,6- dichlorophenyl)amino)-4,5-dihydro-1H-imidazol-1-yl)ethan-1- one C11H11Cl2N3O 54707-71-0
Dabigatran Impurity 10 Dabigatran Etexilate Propanoate C35H43N7O5 1304574-20-6
Ranolazine Related Compound C 1-[(2,6-dimethylphenyl)aminocarbonylmethyl]piperazine C14H21N3O 5294-61-1
Ondansetron Hydrocloride 9-methyl-3-((2-methyl-1H-imidazol-1-yl)methyl)-1,2,3,9- tetrahydro-4H-carbazol-4-one hydrochloride dihydrate C18H22ClN3O2 103639-04-9
1,2-Benzisoxazol-3-ylacetic Acid C9H7NO3 4865-84-3
Metolazone 7- Chloro-1,2,3,4-tetrahydro-2-methyl-3-(2-methylphenyl)-4-oxo-6 quinazolinesulfonamide C16H16ClN3O3S 17560-51-9
Althiazide (3R)-3-[(Allylsulfanyl)methyl]-6-chloro-3,4-dihydro-2H-1,2,4- benzothiadiazine-7-sulfonamide 1,1-dioxide C11H14ClN3O4S3 5588-16-9
Febuxostat 2-[3-Cyano-4-(2-methylpropoxy)phenyl]-4-methylthiazole-5- carboxylic acid C16H16N2O3S 144060-53-7
Lacosamide EP Impurity J Phenylmethanamine C7H9N 100-46-9
Teriflunomide ortho isomer
Bupivacaine EP Impurity A N-(2,6-Dimethylphenyl)pyridine-2-carboxamide C14H14N2O 39627-98-0
Azilsartan Impurity 1 methyl 1-((2'-cyano-[1,1'-biphenyl]-4-yl)methyl) -2-ethoxy-1H-benzo[d]imidazole-7-carboxylate C25H21N3O3 139481-44-0
Dabigatran Impurity 2 N-(4-Cyanophenyl)glycine ; 2-(4-Cyanophenylamino)acetic acid C9H8N2O2 42288-26-6
Prasugrel EP Impurity I 1-cyclopropyl-2-(2-fluorophenyl)ethan-1-one C11H11FO 150322-73-9
Gliclazide 1-(Hexahydrocyclopenta[c]pyrrol-2(1H)-yl)-3-[(4- methylphenyl)sulfonyl]urea C15H21N3O3S 21187-98-4
Pirfenidone EP Impurity B 5-methylpyridin-2(1H)-one C6H7NO 1003-68-5
Atenolol EP Impurity J 2-(4-(3-amino-2-hydroxypropoxy)phenyl)acetamide C11H16N2O3 81346-71-6
Mesalazine EP Impurity N 2-hydroxy-5-nitrobenzoic acid (5-nitrosalicylic acid). ; Mesalamine EP Impurity N C7H5NO5 96-97-9
Metronidazole EP impurity G 2-(2-methyl-5-nitro-1H-imidazol-1-yl)acetic acid C6H7N3O4 1010-93-1
Pregabalin Impurity 4/Pregabalin Impurity B (3-Isobutylglutaric Acid) ; 3-isobutylpentanedioic acid C9H16O4 75143-89-4
Esomeprazole EP Impurity C Omeprazole EP Impurity C ; 5-methoxy-2-[[(4-methoxy-3,5- dimethylpyridin-2-yl)methyl]sulfanyl]-1H-benzimidazole (ufiprazole) C17H19N3O2S 73590-85-9
Omeprazole EP Impurity C Esomeprazole EP Impurity C ; Omeprazole Sulfide C17H19N3O2S 73590-85-9
Pioglitazone M1 Metabolite 5-(4-Hydroxybenzyl)-1,3-thiazolidine-2,4-dione C10H9NO3S 74772-78-4
Telmisartan Methyl Ester 2-(4-{[4-Methyl-6-(1-methyl-1H-1,3-benzodiazol-2-yl) -2-propyl-1H-1,3-benzodiazol-1-yl]methyl}phenyl)benzoic acid methyl ester C34H32N4O2 528560-93-2
Apixaban 1-(4-methoxyphenyl)-7-oxo-6-[4-(2-oxopiperidin-1-yl)phenyl]- 4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide C25H25N5O4 503612-47-3
Candesartan EP Impurity A Candesartan Ethyl Ester ; 2-Ethoxy-1-[[2-[1-(triphenylmethyl) -1H-tetrazol-5-yl][1,1?-biphenyl]-4-yl]methyl]-1H- benzimidazole-7-carboxylic Acid ethyl ester C26H24N6O3 139481-58-6
Clonidine Impurity B( Inhouse) ethylene diamine mono-p-toluenesulfonic acid salt 14034-59-4
Elagolix sodium 4-[[(1R)-2-[5-(2-Fluoro-3-methoxyphenyl)-3-[[2-fluoro-6- (trifluoromethyl)phenyl]methyl]-3,6-dihydro-4-methyl-2,6- dioxo-1(2H)-pyrimidinyl]-1-phenylethyl]amino]butanoic acid C32H30F5N3O5 834153-87-6
Cetirizine Methyl Ester (USP) (RS)-2-[2-[4-[(4-Chlorophenyl)phenylmethyl]piperazin-1-yl] ethoxy]acetic acid methyl ester dihydrochloride C22H27ClN2O3 83881-46-3
3-Methoxy-O-methyltyrosine C11H15NO4 55-59-4
Brexpiprazole Impurity 15 7-(4-chloro butoxy)-1H-quinolin-2-one C13H14ClNO2 913613-82-8
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