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

Phenylbutyric Acid Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-2-Hydroxy-4-phenylbutyric Acid-d5 Stable Isotopes CS-T-56291 1286987-57-2 Enquire
2-Hydroxy-4-phenylbutyric Acid Ethyl Ester-d5 Stable Isotopes CS-T-78382 1189892-05-4 Enquire
2-Phenylbutyric Acid D5 Stable Isotopes CS-T-60393 1189708-92-6 Enquire
2-Phenylbutyric Acid-d5 Methyl Ester Stable Isotopes CS-T-84256 1794940-35-4 Enquire
4-Phenylbutyric Acid-13C6 Stable Isotopes CS-T-84237 1346602-38-7 Enquire
4-Phenylbutyric acid-d11 Stable Isotopes CS-O-10122 358730-86-6 In Stock
Erythro-2-methyl-3(Methoxy-d3)-4-phenylbutyric Acid Stable Isotopes CS-T-97535 224627-72-9 Enquire


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R)-(-)-2-Phenylbutyric Acid Impurities CS-T-60407 938-79-4 Enquire
(S)-2-Hydroxy-4-phenylbutyric Acid Impurities CS-T-78247 115016-95-0 Enquire
(S)-2-Hydroxy-4-phenylbutyric Acid Ethyl Ester Impurities CS-T-78157 125639-64-7 Enquire
(S)-3-(Boc-amino)-4-phenylbutyric acid Impurities CS-AC-04398 51871-62-6 Enquire
2-Mercaptophenylbutyric Acid Impurities CS-T-32037 359436-78-5 Enquire
3-Mercaptophenylbutyric Acid Impurities CS-T-32038 359436-80-9 Enquire
4-Mercaptophenylbutyric Acid Impurities CS-T-32039 359436-81-0 Enquire
Boc-(R)-3-Amino-4-phenylbutyric acid Impurities CS-DL-00775 101555-61-7 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"4,4'-Dithiobisphenylbutyric Acid" Intermediates CS-T-53914 72007-92-2 Enquire
2-(S)-Hydroxy-4-oxo-4-phenylbutyric Acid Intermediates CS-T-56285 146912-63-2 Enquire
2-amino-2-phenylbutyric acid Intermediates CS-O-32250 5438-07-3 Enquire
2-Phenylbutyric Acid Intermediates CS-T-39399 90-27-7 In Stock
3-Oxo-4-phenylbutyric acid methyl ester Intermediates CS-AC-12082 37779-49-0 Enquire
4-Bromo-2,2-diphenylbutyric acid Intermediates CS-O-32253 37742-98-6 Enquire
4-Phenylbutyric Acid Intermediates CS-O-11468 1821-12-1 Enquire
4-Phenylbutyric acid methyl ester Intermediates CS-O-31608 2046-17-5 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-​Oxo-​4-​phenylbutyric Acid Fine Chemicals CS-DE-01551 710-11-2 Enquire
2-Oxo-4-phenylbutyric acid Fine Chemicals CS-DV-01844 710-11-2 In Stock