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Carbamazepine

Chemical name : 5H-dibenzo[b,f]azepine-5-carboxamide

Mol. Formula : C15H12N2O

Mol. Weight : 236.3 g/mol

Carbamazepine EP Impurity-A: (10,11- Dihydrocarbamazepine) (USP RC A)

Code : VC010001

Chemical name : 10,11-dihydro-5H-dibenzo[b,f]azepine-5-carboxamide
Carbamazepine EP Impurity-B

Code : VC010002

Chemical name : 9-methylacridine,
Carbamazepine EP Impurity-C: (N Carbamoyl carbamazepine)

Code : VC010003

Chemical name : (5H-dibenzo[b,f]azepin-5-ylcarbonyl)urea
Carbamazepine EP Impurity-D: (USP RC B) (Iminostilbene)

Code : VC010004

Chemical name : 5H-dibenzo[b,f]azepine
Carbamazepine EP Impurity-E: (Iminodibenzyl)

Code : VC010005

Chemical name : 10,11-dihydro-5H-dibenzo[b,f]azepine
Carbamazepine EP Impurity-F:(5-chlorocarbonyliminostilbene)

Code : VC010006

Chemical name : 5H-dibenzo[b,f]azepine-5-carbonyl chloride
Carbamazepine D10

Code : VC010007

Chemical name : 5H-dibenz[b,f]azepine-d10-5-carboxamide
Acridine

Code : VC010010

Chemical name : 10-Azaanthracene
Carbamazepine-10, 11-epoxide-d10

Code : VC010012

Chemical name : Carbamazepine-10,11-epoxide-d10

Carvedilol

Chemical name : (2RS)-1-(9H-Carbazol-4-yloxy)-3-[[2-(2-methoxyphenoxy)ethyl]amino]propan-2-ol.

Mol. Formula : C24H26N2O4

Mol. Weight : 406.47 g/mol

Carvedilol Impurity A(EP): (USP RC A)

Code : VC020001

Chemical name : 1-[[9-[2-hydroxy-3-[[2-(2-methoxyphenoxy)ethyl]amino]propyl]-9H-carbazol-4-yl]oxy]-3-[[2- (2-methoxyphenoxy)ethyl]amino]propan-2-ol,
Carvedilol Impurity-B(EP): (USP RC B (CarvidilolBis – Carbezol)

Code : VC020002

Chemical name : 1,1’-[[2-(2-methoxyphenoxy)ethyl] nitrilo]bis[3-(9H-carbazol-4-yloxy)propan-2-ol],
Carvedilol Impurity C(EP)(USP RC C) (N-Benzyl – Carvedilol)

Code : VC020003

Chemical name : (2RS)-1-[benzyl[2-(2-methoxyphenoxy)ethyl]amino]-3-(9H-carbazol-4-yloxy)propan-2-ol.
Carvedilol Impurity-D: (USP RC D)

Code : VC020004

Chemical name : 4-(Oxiran-2-ylmethoxy)-9H-carbazole
Carvedilol Impurity-E: (USP RC E)

Code : VC020005

Chemical name : 2-(2-Methoxyphenoxy)ethyl amine.
Carvedilol R-Isomer

Code : VC020006

Chemical name : (2R)-1-(9H-Carbazol-4-yloxy)-3-[[2-(2-methoxyphenoxy)ethyl]amino]propan-2-ol.
Carvedilol S-Isomer

Code : VC020007

Chemical name : (2S)-1-(9H-Carbazol-4-yloxy)-3-[[2-(2-methoxyphenoxy)ethyl]amino]propan-2-ol.
Carvedilol impurity-G

Code : VC020009

Chemical name : 1-[Carbazolyl-(4)-oxy]-3-[N-acetyl-2-(2-methoxyphenoxy)- ethylamino]-propane-2-ol
Carvedilol-d4

Code : VC020013

Chemical name : (2RS)-1-(9H-Carbazol-4-yloxy)-3-[[2-(2-methoxyphenoxy)ethyl]amino]propanol-d4
4-Hydroxy carbazole (Carvedilol Intermediate)

Code : VC020015

Chemical name : 9H-Carbazol-4-ol

Celecoxib

Chemical name : 4-[5-(4-Methylphenyl)-3-trifluoromethyl)-1H-pyrazol-yl]benzenesulfonamide

Mol. Formula : C17H14F3N3O2S

Mol. Weight : 381.37g/mol

Celecoxib Impurity EP A ( USP RC A )

Code : VC030003

Chemical name : (4-[5-(3-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide)
Celecoxib Impurity-: (USP RC B)(EP B)

Code : VC030001

Chemical name : 4-[3-(4-methylphenyl)-5-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide
Celecoxib Impurity-E(BP/EP)

Code : VC030005

Chemical name : 4-hydrazinylbenzenesulfonamide
Celecoxib Impurity-F

Code : VC030006

Chemical name : 4-{(2E)-2-[1-(4-methylphenyl) ethylidene]hydrazinyl}benzenesulfonamide
Celecoxib Impurity-G

Code : VC030007

Chemical name : 4,4,4-trifluoro-1-(4-methylphenyl) butane-1,3-dione
Celecoxib Impurity-B

Code : VC030002

Chemical name : 4-{(2E)-2-[1-(3-methylphenyl) ethylidene]hydrazinyl}benzenesulfonamide
Celecoxib Impurity-D

Code : VC030004

Chemical name : 4-[5-(2-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide
HYDRAZINE IMPURITY

Code : VC030009

Chemical name : 4-Sulfonamidophenylhydrazine Hydrochloride
Cetirizine Glycerol ester Impurity

Code : VC100015

Chemical name : 2,3-dihydroxypropyl 2-(2-(4-((4-chlorophenyl)(phenyl)methyl)piperazin-1-yl)ethoxy)acetate dihyrochloride
Cetirizine Glycerol ester Impurity

Code : VC100015A

Chemical name : 2,3-dihydroxypropyl 2-(2-(4-((4-chlorophenyl)(phenyl)methyl)piperazin-1-yl)ethoxy)acetate
Cetirizine Propanediol Ester Impurity (propylene glycol ester of Cetirizine

Code : VC100018

Chemical name : 2-Hydroxypropyl 2-(2-{4-[(4-chlorophenyl)phenylmethyl]piperazin-1-yl}ethoxy) acetate
Cetirizine d8

Code : VC100019

Chemical name : (±)-[2-[4-[(4-chlorophenyl)phenylmethyl]-1- piperazinyl]ethoxy]acetic acid hydrochloride-d8
Levocetirizine benzene sulfonyl Impurity

Code : VC100021

Chemical name : 1-((4-chlorophenyl)(phenyl)methyl)-4-(phenylsulfonyl)piperazine hydrochloride
(R ) - (-)Cetirizine-d4 DiHCL

Code : VC100022

Chemical name : 2-[2-[4-[(R)-(4-Chlorophenyl)phenylmethyl]-1-piperazinyl]ethoxy-d4]acetic Acid Dihydrochloride
Cetirizine 2-chloro Impurity

Code : VC100023

Chemical name : 1-((2-chlorophenyl)(phenyl)methyl)piperazine hydrochloride

Chlorothiazide

Chemical name : 6-chloro-1,1-dioxo-2H-1,2,4-benzothiadiazine-7-sulfonamide

Mol. Formula : C7H6ClN3O4S2

Mol. Weight : 295.72 g/mol

Benzothiadiazine Related Compound -A

Code : VC040001

Chemical name : 4-amino-6-chloro-1,3-benzene disulfonamide

Ciprofloxacin

Chemical name : 1-Cyclopropyl-6-fluoro-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid

Mol. Formula : C17H18FN3O3

Mol. Weight : 331.34 g/mol

Ciprofloxacin EP Impurity A: (Fluoroquinolonic acid)

Code : VC050001

Chemical name : 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid
Ciprofloxacin EP Impurity B: (Desfluoro compound)

Code : VC050002

Chemical name : 1-cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid
Ciprofloxacin Impurity C(EP): (Ethylenediamine compound)

Code : VC050003

Chemical name : 7-[(2-aminoethyl)amino]-1-cyclopropyl-6-fluoro-4-oxo-1,4-Dihydroquinoline -3-carboxylic acid * Hydrochloride Salt
Ciprofloxacin Impurity D(EP)( USP RC A)

Code : VC050004

Chemical name : 7-chloro-1-cyclopropyl-4-oxo-6-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid.
Ciprofloxacin Impurity E(EP): (Decarboxy Ciprofloxacin)

Code : VC050005

Chemical name : 1-cyclopropyl-6-fluoro-7-(piperazin-1-yl)quinolin-4(1H)-one
Ciprofloxacin Impurity-F(EP): (6-Hydroxy-6-defluoro Ciprofloxacin)

Code : VC050006

Chemical name : 1-cyclopropyl-6-hydroxy-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3- carboxylic acid
Formyl Ciprofloxacin

Code : VC050007

Chemical name : 1-cyclopropyl-6-hydroxy-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3- carboxylic acid
Ciprofloxacin-d8 Hydrochloride

Code : VC050008

Chemical name : 1-Cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(1-piperazinyl-d8)-3-quinoline carboxylic Acid Hydrochloride
Ciprofloxacin Ethyl Ester

Code : VC050009

Chemical name : ethyl 1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxo-7-(piperazin-1-yl)quinoline-3-carboxylate
Ciprofloxacin intermediate -1

Code : VC050010

Chemical name : 1-Cyclopropyl-1,4-dihydro-6,7-difluoro-4-oxoquinoline-3-carboxylic acid
Ciprofloxacin intermediate -2

Code : VC050011

Chemical name : ethyl (E)-3-(dimethylamino)prop-2-enoate
6-Chloro-1-cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid

Code : VC050014

Chemical name : 1-cyclopropyl-6-Chloro -4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid; Ciprofloxacin chloro analog impurity

Citalopram Hydrobromide

Chemical name : (RS)-1-[3-(dimethylamino)propyl]-1- (4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carbonitrile, hydrobromide

Mol. Formula : C20H22BrFN2O

Mol. Weight : 324.39 g/mol

Citalopram EP Imp – A (USP RC A)

Code : VC060001

Chemical name : (1RS)-1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carboxamide (Citalopram Amide)
Citalopram EP Imp B (USP RC B)

Code : VC060002

Chemical name : 1-[3-(dimethylamino)propyl]-1-(4-fluorophenyl)-3-hydroxy-1,3-dihydroisobenzofuran-5-carbonitrile (3-Hydroxy Citalopram)
Citalopram EP Imp C (USP RC C)

Code : VC060003

Chemical name : 3-(3-N,N-Dimethylamino)-1-(4-fluorophenyl)-6-cyano-1(3H)-isobenzofuranone (3-Oxo Citalopram)
Citalopram EP Imp D (USP RC D)

Code : VC060004

Chemical name : 1-(4-fluorophenyl)-1-(3-(methylamino)propyl)-1,3-dihydroisobenzofuran-5-carbonitrile (N-Desmethyl Citalopram )
Citalopram EP Imp E (USP RC E)

Code : VC060005

Chemical name : (1-(3-dimethylaminopropyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carbonitrile-N-oxide (Citalopram N-Oxide)
Citalopram Impurity -F(EP)

Code : VC060006

Chemical name : Bromo Citalopram
Citalopram EP Impurity G

Code : VC060009

Chemical name : 4-(Dimethylamino)-1-[(1R)-1-[3- (dimethylamino)propyl]-1-(4-fluorophenyl)-1,3-dihydro-2- benzofuran-5-yl]butan-1-one
N,N-Didesmethyl Citalopram

Code : VC060007

Chemical name : 1-(3-Aminopropyl)-1-(4-fluorophenyl)-1,3-dihydro-5-isobenzofurancarbonitrile
Citalopram Dihydroxy Impurity

Code : VC060008
Citalopram R -Isomer

Code : VC060010

Chemical name : (R)-(-)-1-[3-(Dimethylamino)propyl]-1-(p-fluorophenyl)-5-phthalan carbonitrile oxalate
Citalopram Oxalate

Code : VC060011

Chemical name : S-(+)-1[3-(dimethyl-amino)propyl]-1-(p-fluorophenyl)-5-phthalancarbonitrile oxalate
Desfluoro Citalopram Oxalate

Code : VC060012

Chemical name : 1-(3-Dimethylaminopropyl)-1-(phenyl)-5-phthalan-carbonitrile oxalate
Citalopram USP related compound G

Code : VC060014
Citalopram Intermediate (3-chloro-N,N,2-trimethylpropan-1-amine)

Code : VC060015

Chemical name : 1-Chloro-2-methyl-3-(dimethylamino)propane
(S)-Citalopram-d6 Oxalate

Code : VC060017

Chemical name : (1S)-1-[3-(Dimethylamino-d6)propyl]-1-(4-fluorophenyl)-1,3-dihydro -5-isobenzo furancarbonitrile Oxalate
Citalopram USP RC F

Code : VC060018

Chemical name : (dimethyl-(1-methyl-3,3-diphenyl-allyl)-amine hydrochloride)
Citalopram Carboxylic Acid Impurity

Code : VC060020

Chemical name : 1-(3-(dimethylamino)propyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carboxylic acid
Citalopram-d4 HBr

Code : VC060022

Chemical name : 1-[3-(Dimethylamino)propyl]-1-(4-fluorophenyl-d4) -1,3-dihydro-5-isobenzofurancarbonitrile Monohydrobromide

Clopidogrel Bisulphate

Chemical name : Methyl (2S)-(2-chlorophenyl)[6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl] acetate sulfate

Mol. Formula : C16H18ClNO6S2

Mol. Weight : 419.90 g/mol

Clopidogrel EP Impurity-A: (USP RC A) (Clopidogrel Carboxylic Acid)

Code : VC070001

Chemical name : (2S)-(2-chlorophenyl)[6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl]acetic acid,
Clopidogrel EP Impurity-B

Code : VC070002

Chemical name : methyl (2S)-(2-chlorophenyl)[4,7-dihydrothieno[2,3-c]pyridin-6(5H)-yl]acetate
Clopidogrel EP Impurity-C: (USP RC C)

Code : VC070003

Chemical name : Methyl (-)-(R)-(o-chlorophenyl)-6,7- dihydrothieno[3,2-c]pyridine-5(4H)-acetate (Clopidogrel Bisulphate R- Isomer)
Clopidogrel Thienylethyl Impurity

Code : VC070004

Chemical name : (S)-2-Chloro-alpha-[[2-(2-thienyl) ethyl]amino]benzene acetic acid methyl ester HCl
Clopidogrel Thieno Impurity

Code : VC070005

Chemical name : 4,5,6,7-Tetrahydrothieno[3,2-c] pyridine hydrochloride:
Clopidogrel Impurity D: (In house)

Code : VC070006
Rac-Clopidogrel-d4 Hydrogen Sulfate

Code : VC070007

Chemical name : α-(2-Chlorophenyl-d4)-6,7-dihydro-thieno[3,2-c]pyridine-5(4H)-acetic Acid Methyl Ester Sulfate
Clopidogrel-d4 Carboxylic Acid

Code : VC070008

Chemical name : 2-Chlorophenyl-d4)-6,7-dihydro thieno[3,2-c]pyridine-5(4H)-acetic Acid
Clopidogrel Related Compound - B

Code : VC070009

Chemical name : (Methyl(+/-)-(o-chlorophenyl)-4,5-dihydrothieno[2,3-c]pyridine-6(7H)-acetate, hydrochloride)
Clopidogrel-d3

Code : VC070012

Chemical name : Clopidogrel-D3 Hydrogensulfate

Clotrimazole

Chemical name : 1-[(2-Chlorophenyl)diphenylmethyl]-1H-imidazole

Mol. Formula : C22H17CIN2

Mol. Weight : 344.83 g/mol

Clotrimazole EP Impurity-A(USP RC A):(2-Chlorotritanol)

Code : VC080001

Chemical name : (2-chlorophenyl)diphenylmethanol
Clotrimazole Impurity-B (EP)

Code : VC080002

Chemical name : 1-[(4-chlorophenyl)diphenylmethyl]-1H-imidazole
Clotrimazole Impurity-C (EP)

Code : VC080003

Chemical name : 1-chloro-2-(chlorodiphenylmethyl) benzene
Clotrimazole Impurity-D (EP)

Code : VC080004

Chemical name : Imidazole
Clotrimazole Impurity – E (EP)

Code : VC080005

Chemical name : (2-chlorophenyl)phenylmethanone (2-chlorobenzophenone)
Clotrimazole Impurity-F(EP)

Code : VC080006

Chemical name : 1-(triphenylmethyl)-1H-imidazole (deschloroclotrimazole)
Clotrimazole Impurity

Code : VC080007

Chemical name : -(2-chlorophenyl)trichloromethane
Clotrimazole Impurity

Code : VC080008

Chemical name : -(2-chlorophenyl)diphenyl methylethylether:
Clotrimazole Impurity

Code : VC080009

Chemical name : -1-[(2-chlorophenyl)diphenylmethyl]-1H-pyrazole
Clotrimazole Impurity

Code : VC080010

Chemical name : 1-Chloro-2-(dichlorophenylmethyl) benzene
Clotrimazole Impurity

Code : VC080011

Chemical name : (2-chlorophenyl)diphenylmethane

Cyclosporine

Chemical name : (E)-14,17,26,32-tetrabutyl-5-ethyl-8-(1-hydroxy-2-methylhex-4-enyl) -,3,9,12,15,18,20,23,27 -nonamethyl-11,29-dipropyl-1,3,6,9,12,15,18,21,24, 27,30- undecaazacyclodotriacontan-,4,7,10,13,16,19,22, 25,28,31-undecaone

Mol. Formula : C62H111N11O12

Mol. Weight : 1202.61 g/mol

Cyclosporine Impurity-A

Code : VC090001

Chemical name : {R-[R * ,R*-(E)]}-cyclic-(L-alanyl-D-alanyl-N-methyl -L -leucyl-N-methyl-L-leucyl-Nmethyl-L-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L- α -amino-butyric-N-methyl-glycinyl-N-methylL-leucyl-L-valyl-N-methyl-leucyl)
Cyclosporine Impurity-B

Code : VC090002

Chemical name : Cyclo[L-alanyl-D-alanyl-N-methyl-L-leucyl-N-methyl-L-leucyl-N-methyl-L-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L-alanyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl]
Cyclosporine Impurity-C

Code : VC090003

Chemical name : Cyclo[L-alanyl-D-alanyl-N-methyl-L- leucyl-N-methyl-L-leucyl-N-methyl-L-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L-threonyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl]
Cyclosporine Impurity-D

Code : VC090004

Chemical name : Cyclo[L-alanyl-D-alanyl-N-methyl-L-leucyl-N-methyl-L-leucyl-N-methyl-L-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L-valyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl]
Cyclosporine Impurity-H

Code : VC090005

Chemical name : Cyclo[L-alanyl-D-alanyl-N-methyl-L-leucyl-N-methyl-L-leucyl-N-methyl-D-valyl-3-hydroxy-N,4-dimethyl-L-2-amino-6-octenoyl-L-2-aminobutanoyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl]
Iso Cyclosporin A

Code : VC090006

Chemical name : (2S,3R,4R,6E)-3-Hydroxy-4-methyl-2-(methylamino)-6-octenoyl-(2S)-2-aminobutanoyl-N-methylglycyl-N-methyl-L-leucyl-L-valyl-N-methyl-L-leucyl-L-alanyl-D-alanyl-N-methyl-L-leucyl-N-methyl-L-leucyl-N-methyl-L-valine (111)-Lactone
Dihydro Cyclosporin A

Code : VC090007

Chemical name : 6-[(2S,3R,4R)-3-Hydroxy-4-methyl-2-(methylamino)octanoic acid]cyclosporin A

Cetirizine(EP/BP)

Chemical name : (±)-[2-[4-[(4-chlorophenyl) phenylmethyl]-1- piperazinyl]ethoxy]acetic acid

Mol. Formula : C21H25ClN2O3

Mol. Weight : 388.89 g/mol

Cetirizine Impurity-A(EP/BP)

Code : VC100001

Chemical name : (RS)-1-[(4-chlorophenyl)phenyl methyl]piperazine
Cetirizine Impurity-B(EP/BP)

Code : VC100002

Chemical name : (RS)-2-[4-[(4-chlorophenyl)phenyl methyl]piperazin-1-yl]acetic acid
Cetirizine Impurity-C(EP/BP)

Code : VC100003

Chemical name : (RS)-2-[2-[4-[(2-chlorophenyl) phenylmethyl] piperazin-1-yl]ethoxy]acetic acid
Cetirizine Impurity-D(EP/BP)

Code : VC100004

Chemical name : 1,4-bis[(4-chlorophenyl) phenylmethyl] piperazine
Cetirizine Impurity-E(EP/BP)

Code : VC100005

Chemical name : (RS)-2-[2-[2-[4-[(4-chloro phenyl) phenyl methyl]piperazin-1-yl] ethoxy acetic acid (ethoxycetirizine)
Cetirizine Impurity-F(EP/BP): (Deschloro Cetrizine Dihydrochloride)

Code : VC100006

Chemical name : [2-[4-(diphenylmethyl) piperazin-1-yl]ethoxy]acetic acid,
Cetirizine Lactose Ester

Code : VC100007

Chemical name : Cetirizine Lactose Ester (α/β-mixture, mixture of diastereomers)
Cetirizine Ethyl Ester (USP RC A)

Code : VC100008

Chemical name : (RS)-2-[2-[4-[(4-Chlorophenyl) phenylmethyl]piperazin-1-yl]ethoxy]acetic acid ethyl ester dihydrochloride
Cetirizine Methyl Ester

Code : VC100009

Chemical name : Methyl 2-[2-[4-[(4-Chlorophenyl) phenylmethyl]-1-piperazinyl]ethoxy]acetate
4-Chlorobenzophenone

Code : VC100010

Chemical name : p-Chlorobenzophenone
4-Chlorobenzhydrol

Code : VC100011

Chemical name : p-chloro benzhydrol
Cetirizine N-Oxide

Code : VC100013

Chemical name : 2-(2-{4-[(4-chlorophenyl) (phenyl) methyl]piperazin-1-yl}ethoxy)acetic acid n-oxide
Cetirizine 3-Chloro Impurity

Code : VC100014

Chemical name : -(2-(4-((3-chlorophenyl)(phenyl)methyl)piperazin-1-yl)ethoxy)acetic acid hydrochloride

의약품용 유연물질, 표준품 전문업체 Specialty of Pharmaceutical Impurity & Reference Standard

의약품용 유연물질, 표준품 전문업체
Specialty of Pharmaceutical Impurity & Reference Standard