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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Pentanoic Acid, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Pentanoic Acid impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Pentanoic Acid-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Pentanoic Acid Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-5-(1,2-Dithiolan-3-yl)pentanoic acid, D5 Stable Isotopes CS-EO-02444 1200-22-2(Unlabelled) Enquire
(αR,​γR)​-γ-​[[(1,​1-​Dimethylethoxy)​carbonyl]​amino]​-​α-​... Stable Isotopes CS-T-97572 Not Available Enquire
(αS,​γR)​-γ-​[[(1,​1-​Dimethylethoxy)​carbonyl]​amino]​-​α-​... Stable Isotopes CS-T-97576 Not Available Enquire
2-[2-(4-Fluorophenyl)-2-oxo-1-phenyl-d5-ethyl]-4-methyl-3-ox... Stable Isotopes CS-T-102972 1020719-43-0 Enquire
2-[2-(4-Fluorophenyl)-2-oxo-1-phenyl-d5-ethyl]-4-methyl-3-ox... Stable Isotopes CS-T-102971 1020719-44-1 Enquire
2-Ethylpentanoic Acid Ethyl Ester-d5 Stable Isotopes CS-T-101419 Not Available Enquire
2-Ethylpentanoic Acid Methyl Ester-d3 Stable Isotopes CS-T-101420 Not Available Enquire
2-Ethylpentanoic Acid-d5 Stable Isotopes CS-T-101421 Not Available Enquire
2-Hydroxy-4-oxopentanoic Acid-13C4 Stable Isotopes CS-T-101295 Not Available Enquire
3-Hydroxy-2,2,4-trimethyl-pentanoic Acid-d6 Stable Isotopes CS-T-103166 35763-45-2 (Unlabelled) Enquire
3-Hydroxy-3-Methylpentanoic Acid-D5 Stable Isotopes CS-F-00230 150-96-9 (unlabelled) Enquire
5-[[Bis(methylamino)methylene]amino]-2-oxo-pentanoic Acid-d6 Stable Isotopes CS-T-101136 107347-91-1(unlabeled) Enquire
5-Hydroxypentanoic Acid Methyl Ester-d4 Stable Isotopes CS-T-101282 Not Available Enquire
N-Acetyl 1,1-Diethylester 5-Aminopentanoic Acid-d6 Stable Isotopes CS-T-100937 Not Available Enquire
Nonafluoropentanoic acid 13C5 Stable Isotopes CS-O-45183 2283397-79-3 Enquire
rac 2-Isopropyl Pentanoic Acid Ethyl Ester-d5 Stable Isotopes CS-T-98555 Not Available Enquire
rac 2-Isopropyl Pentanoic Acid Methyl Ester-d3 Stable Isotopes CS-T-98554 72143-23-8(Unlabelled) Enquire
rac-3-Hydroxypentanoic Acid-D3 Stable Isotopes CS-T-98559 Not Available Enquire
αS,​γS)​-γ-​[[(1,​1-​Dimethylethoxy)​carbonyl]​amino]​-​α-​m... Stable Isotopes CS-T-97574 Not Available Enquire
2,4-Dihydroxypentanoic Acid-13C3 Dicyclohexylamine Stable Isotopes CS-T-101078 Not Available Enquire
5-[[(Dimethylamino)iminomethyl]amino]-2-oxopentanoic Acid-d6 Stable Isotopes CS-T-53491 1419723-92-4 Enquire
5-Aminopentanoic Acid Methyl Ester Hydrochloride-d4 Stable Isotopes CS-T-66711 1215370-80-1 Enquire
5-Bromo-2,2,3,3-tetradeuteropentanoic acid Stable Isotopes CS-O-40924 1202227-71-1 Enquire
7-Ethyl-10-(4-N-aminopentanoic acid)-1-piperidino)carbonylox... Stable Isotopes CS-T-76562 1217816-76-6 Enquire
AKB48-d15 N-Pentanoic Acid Stable Isotopes CS-T-100918 Not Available Enquire
Pentanoic Acid D9 Stable Isotopes CS-O-14313 115871-50-6 Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Ethylpentanoic Acid Methyl Ester Metabolite CS-T-92487 816-16-0 Enquire
5-(4-Amidinophenoxy)pentanoic Acid Metabolite CS-T-01831 144602-61-9 Enquire
7-Ethyl-10-(4-N-aminopentanoic acid)-1-piperidino)carbonylox... Metabolite CS-T-22479 181467-56-1 In Stock
2-Ethylpentanoic Acid Ethyl Ester Metabolite CS-T-92199 43164-26-7 Enquire
ADB-PINACA 5-pentanoic acid metabolite solution Metabolite CS-BX-00849 2104038-51-7 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
((2R,4S)-5-([1,1'-biphenyl]-4-yl)-2-methyl-4-nitropentanoic ... Impurity CS-O-58093 1982356-32-0 Enquire
(S)-5-Amino-4-(4-amino-1-oxoisoindolin-2-yl)-5-oxopentanoic ... Impurity CS-T-103270 874760-72-2 Enquire
2-(2-ethoxy-2-oxoethyl)-4-methylpentanoic acid Impurity CS-O-42707 Not Available Enquire
Methotrexate N -methyl 5-oxopentanoic acid Impurity CS-O-53508 ---- Enquire
rac 2-Isopropyl Pentanoic Acid Impurity CS-T-30021 62391-99-5 In Stock
γ-AMino-benzenepentanoic Acid Impurity CS-T-47615 916198-97-5 Enquire
(+/-)-3-Amino-4-methyl-pentanoic acid hydrochloride Impurity CS-EL-08334 80914-40-5 Enquire
(+/-)-cis -3-Amino-4,4-dimethylpentanoic acid hydrochloride Impurity CS-EL-01618 1335041-90-1 Enquire
(2R,3S)-3-methyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pe... Impurity CS-DV-00116 55780-90-0 Enquire
(2R,4S)-4-amino-5-biphenyl-4-yl-2-methylpentanoic acid hydro... Impurity CS-O-33145 1038924-71-8 Enquire
(2R,4S)-5-([1,1-biphenyl]-4-yl)-4-(3-carboxypyranamido)-2-me... Impurity CS-O-33147 Not Available Enquire
(2S,3S)-(2S,3R)-2-Amino-3-hydroxy-4-methylpentanoic Acid Hyd... Impurity CS-T-47869 5817-22-1 Enquire
(2S,3S)-2-Amino-3-methyl-pentanoic acidmethyl ester hydrochl... Impurity CS-M-16237 18598-74-8 Enquire
(3R,5S)-5-((R)-8-Fluoro-4-isopropyl-2-(N-methylmethylsulfona... Impurity CS-O-43670 854898-48-9 Enquire
(4R)-4-[(tert-Butoxycarbonyl)amino]-5-(1H-indol-3-yl)pentano... Impurity CS-T-67354 959577-59-4 Enquire
(R)-2-Hydroxy-4-methylpentanoic acid Impurity CS-AC-02514 20312-37-2 Enquire
(R)-4-(Boc-amino)-5-phenylpentanoic acid Impurity CS-AC-02054 195867-20-0 Enquire
(S)-2-Amino-5-guanidinopentanoic acid thiazolidine-2,4-dicar... Impurity CS-MM-10933 30986-62-0 Enquire
(S)-3-(((Benzyloxy)carbonyl)amino)-5-isopropoxy-5-oxopentano... Impurity CS-T-48830 5545-52-8 Enquire
(S)-5-Acetoxy-4-methylpentanoic Acid Impurity CS-T-64513 1346617-41-1 Enquire
(S)-5-Carbamoyl-3-(9h-fluoren-9-ylmethoxycarbonyl-amino)-pen... Impurity CS-T-69206 283160-17-8 Enquire
(S)-Boc-4-amino-pentanoic acid Impurity CS-AC-04897 207924-92-3 Enquire
1-Piperidinepentanoic acid, γ-cyano-β-imino-4-methyl-3-(meth... Impurity CS-O-40534 2102039-99-4 Enquire
2-(4-Methoxy-benzoylamino)-4-methyl-pentanoic acid Impurity CS-M-16246 438581-55-6 Enquire
2,2-DIFLUORO-3,4,5-TRIHYDROXY-PENTANOIC ACID Impurity CS-O-40236 Not Available Enquire
2,5-Diaminopentanoic acid hydrochloride Impurity CS-M-25785 1069-31-4 Enquire
2-[2-([1,3,4]Thiadiazol-2-ylcarbamoyl)-ethyl]-pentanoic acid Impurity CS-M-06893 380585-19-3 Enquire
2-hydroxy-4-methyl-Pentanoic acid, calcium salt (2:1) Impurity CS-DV-01735 93778-33-7 Enquire
2-Hydroxy-4-oxopentanoic Acid Impurity CS-T-78794 54031-97-9 Enquire
3,5-DIBENZYLOXY-2,2-DIFLUORO-4-HYDROXY-PENTANOIC ACID Impurity CS-O-40234 Not Available Enquire
3-Amino-4-methylpentanoic acid Impurity CS-M-26964 5699-54-7 Enquire
3-Methyl-2-(1-oxo-1,3-dihydro-2H-isoindol-2-yl) pentanoic ac... Impurity CS-M-26938 180923-81-3 Enquire
3-Oxo-2-propylpentanoic Acid Methyl Ester Impurity CS-T-84863 1391052-84-8 Enquire
4-(N-Boc-amino)-3-oxo-pentanoic Acid Methyl Ester Impurity CS-T-07429 101669-78-7 Enquire
4,5-Diamino-5-oxopentanoic acid Impurity CS-EO-01359 328-48-3 Enquire
4-Amino-4-methylpentanoic acid Impurity CS-M-47174 3235-46-9 Enquire
5-((2R,3aR,4R,5R,6aS)-4-((S,E)-3-Hydroxyoct-1-en-1-yl)hexahy... Impurity CS-O-40218 91284-06-9 Enquire
5-(2,3-Dihydro-1,4-benzodioxin-6-ylamino)-5-oxopentanoic aci... Impurity CS-M-06781 329043-16-5 Enquire
5-(Dimethylamino)pentanoic Acid Impurity CS-DJ-00037 89855-60-7 Enquire
5,5,5-trifluoro-3-oxo-pentanoic acid methyl ester Impurity CS-DV-02967 915213-24-0 Enquire
5-[3-(Isobutyrylamino)anilino]-5-oxopentanoic acid Impurity CS-M-15758 925610-44-2 Enquire
5-[4-(Isobutyrylamino)anilino]-5-oxopentanoic acid Impurity CS-M-15754 925084-82-8 Enquire
5-{3-[(Butylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15757 940536-60-7 Enquire
5-{3-[(Diethylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15742 940218-46-2 Enquire
5-{3-[(Isopropylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15762 940515-35-5 Enquire
5-{3-[(sec-Butylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15751 940499-63-8 Enquire
5-{4-[(3-Methylbutanoyl)amino]anilino}-5-oxopentanoic acid Impurity CS-M-15752 940214-39-1 Enquire
5-{4-[(Diethylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15750 940532-51-4 Enquire
5-{4-[(Ethylanilino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-15749 941422-98-6 Enquire
5-{4-[(tert-Butylamino)carbonyl]anilino}-5-oxopentanoic acid Impurity CS-M-23700 897784-04-2 Enquire
5-Amino-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]-amino}-5-oxope... Impurity CS-M-26500 71989-20-3 Enquire
5-Hydroxy-4-[(methoxycarbonyl)amino]-pentanoic Acid Ethyl Es... Impurity CS-T-78945 1346598-01-3 Enquire
Fmoc-(R)-4-amino-5-phenylpentanoic Acid Impurity CS-T-74171 269078-74-2 Enquire
N-Boc-4-aminopentanoic Acid Impurity CS-T-07430 172833-22-6 Enquire
Pentanoic acid, 4,4,5,5,5-pentafluoro- Impurity CS-DL-00562 3637-31-8 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2S)-2-Amino-5-tert-butoxy-5-oxopentanoic acid Intermediate CS-M-47033 2419-56-9 In Stock
(4S)-4-Amino-5-methoxy-5-oxopentanoic acid hydrochloride Intermediate CS-O-51586 60080-68-4 Enquire
5-(Diphenylphosphinyl)pentanoic Acid Intermediate CS-T-53862 71140-70-0 Enquire
5-Amino-4-hydroxypentanoic acid Intermediate CS-ED-42344 25635-44-3 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Ethylpentanoic Acid Fine Chemicals CS-T-54235 20225-24-5 In Stock
2-oxopentanoic acid Fine Chemicals CS-DE-01512 1821-02-9 Enquire
Nonafluoropentanoic Acid Fine Chemicals CS-T-83629 2706-90-3 In Stock
Perfluoro-4-(2-sulfoethoxy)pentanoic acid Fine Chemicals CS-ED-41970 2416366-18-0 Enquire
(3R)-3-(4-(2-hydroxypropyl)-2-oxopyrrolidin-1-yl)-2-oxopenta... Fine Chemicals CS-O-40549 Not Available Enquire
(4S)-4-amino-5-(dimethylamino)-5-oxopentanoic acid Fine Chemicals CS-O-34477 87733-70-8 Enquire
(S)-2-amino-5-(((R)-4-amino-1-carboxy-4-oxobutyl)amino)-5-ox... Fine Chemicals CS-O-37324 Not Available Enquire
2-Hydroxy-4-methylpentanoic acid Fine Chemicals CS-ED-01856 498-36-2 Enquire
3-Amino-5-phenylpentanoic Acid Fine Chemicals CS-DJ-00169 91247-38-0 Enquire
3-Methylpentanoic acid Fine Chemicals CS-M-01299 105-43-1 Enquire
4-methyl-3-(methylethyl)pentanoic acid Fine Chemicals CS-ED-02258 261356-88-1 Enquire
4-Methylpentanoic acid Fine Chemicals CS-M-01300 646-07-1 Enquire
5-((3-(3-(4-chlorophenyl)propoxy)propyl)amino)pentanoic acid Fine Chemicals CS-O-40574 Not Available Enquire
5-((4-(3-Carbamoyl-1-(4-methoxyphenyl)-7-oxo-4,5-dihydro-1H-... Fine Chemicals CS-TA-86542 2206825-87-6 Enquire
5-(2-Oxido-1,2-dithiolan-3-yl)pentanoic Acid Fine Chemicals CS-K-00289 108015-78-7 Enquire
5-(Benzyloxycarbonylamino)pentanoic acid Fine Chemicals CS-MM-27626 23135-50-4 Enquire
5-Hydroxypentanoic Acid Sodium Salt Fine Chemicals CS-T-78456 37435-69-1 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-((4-(5-morpholino-6-oxo-3,6-dihydropyridin-1(2H)-yl)phenyl... Nitrosamine CS-O-49703 Not Available Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2,2-Dipropylpentanoic acid Secondary Standards CS-SS-26443 52061-75-3 Enquire
2-Ethylpentanoic acid Secondary Standards CS-SS-26421-100MG 20225-24-5 Enquire
pentanoic acid (valeric acid) Secondary Standards CS-SS-25855-50MG 109-52-4 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-(3,3-Dimethyl-d6-guanidino)-2-hydroxypentanoic Acid Stable Isotope Reagent CS-T-101479 Not Available Enquire
5‑(4‑fuorophenyl)‑5‑oxopentanoic acid-d4 Stable Isotope Reagent CS-O-46216 2446819-94-7 Enquire
4-Methylpentanoic Acid-d12 Stable Isotope Reagent CS-C-00546 116287-57-1 Enquire


Peptide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-5-Amino-2-((S)-2,5-diamino-5-oxopentanamido)-5-oxopentan... Peptide CS-BL-00149 54419-93-1 Enquire


Pharmaceutical Stds.

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2R,4S)-5-([1,1'-Biphenyl]-4-yl)-4-(4-ethoxy-4-oxobutanamido... Pharmaceutical Stds. CS-TA-30796 149709-49-9 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Hydroxypentanoic acid Building Blocks CS-O-45865 13392-69-3 Enquire
(R)-Fmoc-4-amino-5-(1h-indol-3-yl)-pentanoic acid Building Blocks CS-T-75120 917099-01-5 Enquire
(R)-Fmoc-4-amino-5-tert-butoxy-pentanoic Acid Building Blocks CS-T-76337 1014018-79-1 Enquire
(S)-Fmoc-4-amino-pentanoic Acid Building Blocks CS-T-76937 1014018-41-7 Enquire
2-hydroxy-3-methylpentanoic acid Building Blocks CS-TB-68466 488-15-3 Enquire
2-Hydroxypentanoic Acid Building Blocks CS-T-93997 617-31-2 Enquire
4-bromopentanoic acid Building Blocks CS-TA-77713 Not Available Enquire
4-hydroxypentanoic acid Building Blocks CS-ED-41579 13532-37-1 Enquire
5,5,5-Trifluoro-4-oxopentanoic Acid Building Blocks CS-T-45395 684-76-4 Enquire
5,5,5-Trifluoropentanoic acid Building Blocks CS-M-04890 407-62-5 Enquire
5-Oxo-5-((4-(3-(trifluoromethyl)-3H-diazirin-3-yl)benzyl)ami... Building Blocks CS-O-43636 1391025-56-1 Enquire
5-tert-butoxy-5-oxopentanoic acid Building Blocks CS-T-94164 63128-51-8 Enquire
Boc-5-aminopentanoic acid Building Blocks CS-M-29441 27219-07-4 Enquire
Fmoc-(3s,4s)-4-amino-3-hydroxy-5-phenyl pentanoic acid Building Blocks CS-T-75462 198542-01-7 Enquire
Fmoc-(3s,4s)-4-amino-3-hydroxy-pentanoic acid dcha Building Blocks CS-T-76828 204316-31-4 Enquire
Fmoc-(R)-3-amino-5-phenylpentanoic acid Building Blocks CS-M-30063 269398-87-0 Enquire
FMOC-(S)-3-AMINO-5-PHENYLPENTANOIC ACID Building Blocks CS-M-29496 219967-74-5 Enquire
Fmoc-2-amino-3-hydroxypentanoic acid Building Blocks CS-M-29878 1219207-99-4 Enquire
Fmoc-5-aminopentanoic acid Building Blocks CS-M-29457 123622-48-0 Enquire
Fmoc-l-2-amino-5-phenyl-pentanoic acid Building Blocks CS-T-76437 959578-11-1 Enquire