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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Butanoic Acid, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Butanoic 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 Butanoic 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.

Butanoic Acid Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2R)-2-(Acetylamino)butanoic Acid-d3 Stable Isotopes CS-T-97068 Not Available Enquire
(2R)-2-(Acetylamino)butanoic Acid-d5 Stable Isotopes CS-T-100940 Not Available Enquire
(2R)-2-Methyl-butanoic Acid Ethyl Ester-d5 Stable Isotopes CS-T-97314 Not Available Enquire
(2R)-2-Methyl-butanoic Acid Methyl Ester-d3 Stable Isotopes CS-T-97315 Not Available Enquire
(2S)-2-Methyl-butanoic Acid Ethyl Ester-d5 Stable Isotopes CS-T-97312 Not Available Enquire
(2S)-2-Methyl-butanoic Acid Methyl Ester-d3 Stable Isotopes CS-T-97313 Not Available Enquire
(2S,3S)-3-Hydroxy-2-methylbutanoic Acid-d3 Stable Isotopes CS-T-97426 Not Available Enquire
(2Z)-Methyl 4-Bromo-2-(methoxyimino)-3-oxo-butanoic Acid Est... Stable Isotopes CS-T-100044 Not Available Enquire
(cis/trans)-2-(4-Benzofurazanylmethylene)-3-oxo-butanoic Aci... Stable Isotopes CS-T-101862 1185237-60-8 Enquire
(E)-2-[(2-Chlorophenyl)methylene]-4-[2-(1,3-dihydro-1,3-diox... Stable Isotopes CS-T-101679 Not Available Enquire
(R)​-2,​4-Diamino-Butanoic acid Dihydrochloride-d3 (major) Stable Isotopes CS-T-103060 Not Available Enquire
(R)​-2,​4-Diamino-Butanoic acid Dihydrochloride-d3 (majo... Stable Isotopes CS-T-94875 Not Available Enquire
(S)-2-Di(tert-butyloxycarbonyl)amino-4-cyano-13C-butanoic Ac... Stable Isotopes CS-T-96977 Not Available Enquire
(Z)-2-[(2-Chlorophenyl)methylene]-4-[2-(1,3-dihydro-1,3-diox... Stable Isotopes CS-T-101680 Not Available Enquire
2-(Acetylamino)butanoic Acid-d5 Stable Isotopes CS-T-100929 Not Available Enquire
3,3-Dimethylbutanoic Acid-d9 Stable Isotopes CS-T-102552 1070-83-3(Unlabelled) Enquire
4-​(Dimethyloxidoamino)​butanoic Acid-d6 Hydrochloride Stable Isotopes CS-T-96719 Not Available Enquire
4-(1-Methyl-d3-5-morpholino-1H-benzo[d]imidazol-2-yl)butanoi... Stable Isotopes CS-T-100071 Not Available Enquire
4-(2,4-Dichlorophenoxy)butanoic Acid-13C6 Stable Isotopes CS-T-96249 Not Available Enquire
4,4,4-Trifluorobutanoic acid- d4 Stable Isotopes CS-T-100996 Not Available Enquire
4,4,4-Trifluorobutanoic acid-13C3 Stable Isotopes CS-T-100997 Not Available Enquire
JWH 073 N-butanoic acid-D7 Stable Isotopes CS-T-102704 1307803-52-6(Unlabelled) Enquire
Vitamin B6 4-(N-(Butanoic Acid-d6))-N-hydroxysuccinimide Stable Isotopes CS-T-99731 Not Available Enquire
y-Oxo-1-pyrenebutanoic Acid-13C4 Stable Isotopes CS-T-96689 Not Available Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
JWH073-butanoic acid metabolite Metabolite CS-EK-01830 1307803-52-6 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(3S)-3-amino-4-(2,4,5-trifluorophenyl)butanoic acid Impurity CS-O-43279 1217854-08-4 Enquire
(R,E)-4-((1-([1,1'-biphenyl]-4-yl)-5-ethoxy-4-methyl-5-oxope... Impurity CS-O-39571 Not Available Enquire
(S)-2-Aminobutanoic Acid Hydrochloride Impurity CS-T-02090 5959-29-5 Enquire
(αS)-α-[[(1S)-1-Carboxyethyl]amino]benzenebutanoic Acid Impurity CS-T-92556 84023-58-5 Enquire
[R-(R*,S*)]-α-[(1-Carboxyethyl)amino]-γ-oxo-benzenebutanoic ... Impurity CS-T-71142 105167-27-9 In Stock
2(R,S)-Hydroxy-4[[(2R)-2-hydroxy-2-(3-hydroxyphenyl)ethyl]me... Impurity CS-T-27511 1217525-08-0 Enquire
2-[(2-Chlorophenyl)methylene]-4-[2-(1,3-dihydro-1,3-dioxo-2H... Impurity CS-T-72617 400024-08-0 Enquire
2-amino-2-phenylbutanoic acid Impurity CS-O-44768 5438-07-3 Enquire
2-amino-3-(3-methyl-3H-diazirin-3-yl)butanoic acid Impurity CS-O-55197 851961-06-3 Enquire
2-Amino-3-methyl-3-sulfino-4-(1H-1,2,3-triazol-1-yl)butanoic... Impurity CS-T-47951 118175-11-4 Enquire
2-Hydroxy-4-methylthiobutanoic acid Impurity CS-DV-01736 583-91-5 Enquire
3-​amino-​4-​(2,​4,​5-​trifluorophenyl)​butanoic acid hydroc... Impurity CS-N-05271 1909337-07-0 Enquire
3-Hydroxy-4-oxobutanoic Acid Phenylephrine Impurity CS-T-56068 830346-80-0 Enquire
4-((3R,5S)-5-([1,1'-Biphenyl]-4-ylmethyl)-3-methyl-2-oxopyrr... Impurity CS-TA-30797 2216746-87-9 Enquire
4-(4-Nitrophenyl)Butanoic Acid Impurity CS-M-47419 5600-62-4 In Stock
4-(Dimethylamino)Butanoic Acid Hydrochloride Impurity CS-M-25948 69954-66-1 In Stock
4,4-dichlorobutanoic acid Impurity CS-O-40385 151675-58-0 Enquire
4-[(2,4-Dihydroxy-3,3-dimethylbutanoyl)amino]-butanoic acid Impurity CS-M-44131 18679-90-8 Enquire
4-Hydroxybutanoic Acid Impurity CS-DV-02824 591-81-1 Enquire
5-[(2-Chloroethyl)(2-hydroxyethyl)amino]-1-methyl-1H-benzimi... Impurity CS-T-50856 898224-95-8 Enquire
Palbociclib oxobutanoic acid Impurity Impurity CS-O-35203 1974279-21-4 In Stock
Tolvaptan γ-Hydroxybutanoic Acid Impurity Impurity CS-T-86653 1346599-75-4 Enquire
Tolvaptan γ-oxobutanoic acid impurity Impurity CS-T-86904 1346599-56-1 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(S)-2-amino-4-methoxybutanoic acid Intermediate CS-ED-41819 3311-01-1 Enquire
2-amino-4-(pyridin-3-yl)butanoic acid Intermediate CS-O-49844 99461-41-3 Enquire
2-oxo-4-(pyridin-3-yl)butanoic acid Intermediate CS-O-49835 780750-43-8 Enquire
4-(2-Bromophenoxy)butanoic acid Intermediate CS-O-49623 132902-25-1 Enquire
4-Ethoxy-4-oxobutanoic acid Intermediate CS-M-13873 1070-34-4 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2S)-2-Azido-3-methylbutanoic acid Fine Chemicals CS-O-52901 40224-47-3 Enquire
(S)-2-((2(1H-tetrazol-5-yl)biphenyl-4-yl)methylamino)-3-meth... Fine Chemicals CS-O-37551 Not Available Enquire
(S)-2-(4-(difluoromethoxy)phenyl)-3-methylbutanoic acid Fine Chemicals CS-O-56388 75391-60-5 Enquire
(Z)-4-amino-3-((5-aminohept-6-enoyl)imino)butanoic acid Fine Chemicals CS-O-54383 ---- Enquire
2-(1-Carboxypropoxy)butanoic acid Fine Chemicals CS-O-61012 19201-33-3 Enquire
2-(3-Bromophenyl)-3-hydroxy-3-methylbutanoic acid Fine Chemicals CS-O-38177 1911568-51-8 Enquire
2,4-dichlorobutanoic acid Fine Chemicals CS-O-34112 18017-35-1 Enquire
2-HYDROXY-2-PHENYLBUTANOIC ACID Fine Chemicals CS-ZB-00524 35468-69-0 Enquire
2-Oxo-4-phenylbutanoic acid Fine Chemicals CS-M-46623 710-11-2 In Stock
3-(2-oxopyrrolidin-1-yl)butanoic acid Fine Chemicals CS-ZB-23741 100911-30-6 Enquire
3-(4-Isobutyrylphenyl)butanoic acid Fine Chemicals CS-O-34757 Not Available Enquire
3,4 dihydroxy butanoic acid Fine Chemicals CS-O-37101 1518-61-2 Enquire
3-Hydroxy-2-methylbutanoic Acid Fine Chemicals CS-T-27578 473-86-9 In Stock
3-oxo-4-(2,4,5-trifluorophenyl)butanoic acid Fine Chemicals CS-O-37598 1256815-03-8 Enquire
4-(1-Methylcyclopropyl)butanoic acid Fine Chemicals CS-ZG-53515 39223-32-0 Enquire
4-Aminobutanoic acid Fine Chemicals CS-E-05265 56-12-2 In Stock
4-bromo-3-oxobutanoic acid Fine Chemicals CS-O-36773 27807-85-8 Enquire
4-Chloro-2-((2-methoxy-2-oxoethoxy)-imino)-3-oxobutanoic aci... Fine Chemicals CS-MM-09814 84080-70-6 Enquire
4-Chloro-3-oxobutanoic acid Fine Chemicals CS-MM-47592 27807-84-7 Enquire
4-Chlorobutanoic acid Fine Chemicals CS-MM-12487 627-00-9 Enquire
4-Hydroxybutanoic acid lactone Fine Chemicals CS-O-13298 96-48-0 In Stock
Butanoic acid Fine Chemicals CS-T-09684 107-92-6 In Stock
Perfluoro-4-isopropoxybutanoic acid Fine Chemicals CS-ED-41961 801212-59-9 Enquire
Perfluoro-4-methoxybutanoic acid Fine Chemicals CS-O-49815 863090-89-5 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(N-nitroso,N-methylamino)-2-phenyl-n-butanoic acid methyl ... Nitrosamine CS-O-44387 Not Available Enquire
4-(2-(methyl(nitroso)amino)ethoxy)-4-oxobutanoic acid Nitrosamine CS-O-53873 ---- Enquire
N-Nitroso Ribociclib N-oxobutanoic acid Nitrosamine CS-O-55155 ---- Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Perfluoro-n-[13C4]butanoic acid Stable Isotope Reagent CS-O-45174 1017281-29-6 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-2,3-dihydroxy-3-methylbutanoic acid Building Blocks CS-O-45173 19451-56-0 Enquire
(S)-2-Amino-2-phenylbutanoic acid Building Blocks CS-O-57671 52247-77-5 Enquire
(S)-3-Methyl-2-phenylbutanoic acid Building Blocks CS-O-48382 13490-69-2 Enquire
2,4-Diaminobutanoic Acid Building Blocks CS-TB-17137 305-62-4 Enquire
2,4-Dihydroxybutanoic Acid Lithium Salt Building Blocks CS-TB-25364 170033-68-8 Enquire
4-((4-hydroxybutanoyl)oxy)butanoic acid, sodium salt Building Blocks CS-O-47905 Not Available Enquire
4-(4-hydroxybutanoyloxy) butanoic acid Building Blocks CS-O-48063 Not Available Enquire
Fmoc-(2S,3S)-2-amino-3-methoxybutanoic acid Building Blocks CS-M-29870 1279029-70-7 Enquire