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

Proline Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(4S)-4-(Phenylthio)-L-proline-d5 Hydrochloride Stable Isotopes CS-T-94385 105107-84-4(Unlabelled) Enquire
Cis-4-Hydroxy-L-proline-2,5,5 D3 Stable Isotopes CS-O-15051 618-27-9 (Unlabeled) Enquire
Des(4-cyclohexyl-L-proline) Fosinopril Acetic Acid-d7 Stable Isotopes CS-T-97635 Not Available Enquire
DL-Proline-2,5,5-d3 Stable Isotopes CS-T-94101 784086-28-8 Enquire
L-Alanyl-L-proline-d3 t-Butyl Ester Stable Isotopes CS-T-100917 Not Available Enquire
L-Proline-d3-N-Fmoc Stable Isotopes CS-T-99862 Not Available Enquire
N-Nitroso L-Proline-d3 Stable Isotopes CS-O-11223 2140267-23-6 In Stock
N-Nitroso-DL-Proline-d3 Stable Isotopes CS-O-10299 65807-08-1 In Stock
N-Nitroso-L-proline D7 Stable Isotopes CS-O-53737 7519-36-0 (Unlabeled) Enquire
rac-Des(4-cyclohexyl-L-proline) Fosinopril Acetic Acid-d7 Stable Isotopes CS-T-101091 Not Available Enquire
S-(Pentafluoro-6-methylbenzene) Captopril (Proline-2,5,5-d3) Stable Isotopes CS-T-97228 Not Available Enquire
S-[3-(2,5,6-Trimethyl)bimanyl] Captopril (Proline 2,5,5-d3) Stable Isotopes CS-T-97126 Not Available Enquire
trans-4-Hydroxy-L-proline-d4 (Major) Stable Isotopes CS-T-102915 2734920-51-3 Enquire
trans-4-Hydroxy-L-proline-d6 Stable Isotopes CS-T-100179 Not Available Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Proline rubidium salt API CS-O-51900 151600-44-1 Enquire
N-Glycylproline API CS-T-25649 704-15-4 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
((S)-4-(2-chlorophenyl)-1-ethoxy-1-oxobutan-2-yl)-L-alanyl-L... Impurity CS-O-58632 85918-76-9 Enquire
((S)-4-(4-chlorophenyl)-1-ethoxy-1-oxobutan-2-yl)-L-alanyl-L... Impurity CS-O-58633 ---- Enquire
(4R)-4-[2-(1,1-Dimethylethoxy)-2-oxoethoxy]-L-proline Impurity CS-O-58110 2173568-86-8 Enquire
(4S)-4-(Phenylthio)-L-proline Hydrochloride Impurity CS-T-60509 105107-84-4 In Stock
(R)-hydroxyproline amino benzoic acid Impurity CS-O-48684 444057-65-2 Enquire
(Trans)-4-Cyclohexylproline Impurity CS-O-32305 103201-78-1 Enquire
1-(N-(S-1-Carboxy-3-cyclohexylpropyl)-L-Alanyl) L-Proline-et... Impurity CS-O-56402 ---- Enquire
1-(tert-butyl) 2-methyl (2S,4R)-4-fluoropyrrolidine-1,2-dica... Impurity CS-BX-02491 203866-18-6 In Stock
Dapagliflozin Diproline Impurity CS-EO-03461 960404-62-0 Enquire
DL-Proline Impurity CS-T-40571 609-36-9 In Stock
Eletriptan Ethyl Indole Proline Impurity CS-T-54521 209682-64-4 In Stock
Fmoc-O-tert-butyl-D-trans-4-hydroxyproline Impurity CS-BX-02694 268729-12-0 Enquire
Ipragliflozin L-Proline Impurity CS-O-13214 951382-34-6 In Stock
Lisinopril Des-Proline Dimer – I Impurity CS-P-08294 Not Available In Stock
Lisinopril Des-Proline Dimer-II Impurity CS-P-08292 ---- In Stock
L-Proline β-naphthylamide hydrochloride Impurity CS-BX-02706 97216-16-5 Enquire
Pidotimod (R,R)-Thioproline dimer impurity Impurity CS-O-46196 Not Available Enquire
1-[(2R)-3-(acetylthio)-2-methyl-1-oxopropyl]-D-Proline Impurity CS-O-07525 224626-08-8 Enquire
cis-4-Hydroxy-D-proline Impurity CS-T-56392 2584-71-6 Enquire
D-Thioproline Impurity CS-T-44136 45521-09-3 Enquire
N-​Boc-​cis-​4-​N-​Fmoc-​amino-​L-​proline Impurity CS-T-67637 174148-03-9 Enquire
N-Benzyl-(S)-proline Impurity CS-T-06251 31795-93-4 Enquire
Pidotimod Thioproline dimer impurity Impurity CS-O-42606 1527463-63-3 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Proline t-butyl ester Intermediate CS-M-47114 2812-46-6 In Stock
L-Prolylglycyl-L-proline Intermediate CS-O-59100 7561-51-5 Enquire
N-Boc-4-Oxo-L-proline Intermediate CS-M-57250 84348-37-8 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(4S)-4-Phenyl-D-proline ethyl ester Fine Chemicals CS-O-51815 1820999-06-1 Enquire
4-Phenylproline methyl ester Fine Chemicals CS-O-51819 1466813-84-2 Enquire
Glycyl-L-proline 7-amido-4-methylcoumarin hydrobromide Fine Chemicals CS-CE-00752 115035-46-6 Enquire
L-Proline Fine Chemicals CS-T-40567 147-85-3 In Stock
L-Proline tetrazole Fine Chemicals CS-P-09174 33878-70-5 Enquire
L-Thioproline Fine Chemicals CS-O-32009 34592-47-7 In Stock
L-Alanyl-L-proline Fine Chemicals CS-T-01512 13485-59-1 Enquire
N2-((S}-1-Corboxy-3 phenylpropyl)-N6- (ethoxy carbonyl)-L-ly... Fine Chemicals CS-O-34508 Not Available Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-nitroso-DL-Proline Nitrosamine CS-O-49119 2571-28-0 In Stock
N-Nitroso D-Hydroxyproline Nitrosamine CS-O-58481 1932275-09-6 Enquire
N-Nitroso-D-proline (Mixture of Isomers) Nitrosamine CS-T-37290 42022-03-7 In Stock
Vildagliptin N-Nitroso-L-Proline Methyl Ester Nitrosamine CS-EO-01927 35909-01-4 In Stock


Peptide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Isoleucyl-L-prolyl-L-proline Peptide CS-BX-02576 26001-32-1 Enquire
L-Valyl-L-prolyl-L-proline Peptide CS-BX-02575 58872-39-2 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-Hydroxy-proline-N,N-dimethylamine-D6 Stable Isotope Reagent CS-O-54561 ---- Enquire
DL-Proline D7 Hydrochloride Stable Isotope Reagent CS-T-60778 65807-21-8 (Freebase) Enquire
L-Proline-2,5,5-d3 Stable Isotope Reagent CS-BX-00428 65807-22-9 In Stock
N-Glycyl-L-proline-D7 Stable Isotope Reagent CS-T-103957 704-15-4(unlabelled) Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(Fmoc-O-t-butyl-L-4-hydroxyproline Building Blocks CS-M-29841 122996-47-8 Enquire
1-L-Prolyl-L-proline Hydrochloride Building Blocks CS-ED-42209 76932-06-4 Enquire
D-Proline Building Blocks CS-M-57677 344-25-2 In Stock
L-Proline, methyl ester Building Blocks CS-O-47363 2577-48-2 Enquire
N-Acetyl-L-proline Building Blocks CS-O-30988 68-95-1 In Stock
N-Phenacetyl-L-proline Building Blocks CS-O-56958 2752-38-7 Enquire
((Benzyloxy)carbonyl)-D-prolyl-L-proline Building Blocks CS-O-52375 1221446-62-3 Enquire
(4R)-4-Hydroxy-1-methyl-L-proline Building Blocks CS-T-78532 4252-82-8 Enquire
(4R)-4-Propyl-L-proline Building Blocks CS-O-16130 31101-27-6 Enquire
1-[(2S)-3-(Acetylthio)-2-methylpropionyl]-L-proline Building Blocks CS-O-32312 64838-55-7 Enquire
N-(tert-Butoxycarbonyl)-L-proline Building Blocks CS-T-49551 15761-39-4 Enquire
N-Boc-cis-4-hydroxy-D-proline Building Blocks CS-G-00109 135042-12-5 Enquire
N-CBZ-Glycyl-L-proline 7-Amido-4-methylcoumarin Building Blocks CS-T-68993 68542-93-8 Enquire


Deuterated Reagents

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
trans-4-Hydroxy-L-proline-d3 Deuterated Reagents CS-T-78819 1356016-86-8 Enquire