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

Histidine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-Nitroso-L-histidine-d5 Stable Isotopes CS-O-58986 932446-62-3 (Unlabeled) Enquire
L-Histidine Hydrochloride Hydrate (13C6,15N3) Stable Isotopes CS-T-103152 202468-43-7 Enquire
L-Histidine Hydrochloride Hydrate 13C6 Stable Isotopes CS-T-96308 201740-88-7 Enquire
N,N-Dimethyl-L-histidine-d6 Methyl Ester Dihydrochloride Stable Isotopes CS-T-96970 Not Available Enquire
Nα-Fmoc-L-histidine-1-15N Stable Isotopes CS-T-96957 Not Available Enquire
Nα-Fmoc-L-histidine-3-15N Stable Isotopes CS-T-96956 Not Available Enquire
rac Histidine-13C6,15N3 Stable Isotopes CS-T-96939 Not Available Enquire
1-Methyl-L-histidine-d5 Stable Isotopes CS-T-81959 1795786-96-7 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Histidine mono Hydrochloride API CS-O-01613 645-35-2 In Stock
L-Histidine mono Hydrochloride API CS-O-30629 5934-29-2 In Stock
(+/-)-Homohistidine API CS-T-55680 5817-77-6 Enquire
DL-Histidine API CS-DE-00107 4998-57-6 Enquire
DL-Histidine hydrochloride monohydrate API CS-DK-00013 6459-59-2 Enquire
Fructose-histidine API CS-T-74271 25020-13-7 Enquire
L-Homohistidine API CS-T-55679 58501-47-6 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-Methyl-L-histidine Impurity CS-T-33970 332-80-9 In Stock
2-Oxo Histidine Impurity CS-O-44620 151436-49-6 Enquire
L-Histidine N-oxide Impurity CS-O-56192 ---- Enquire
Desamino (aS)-Chloro Histidine Methyl Ester Impurity CS-T-52062 64407-67-6 Enquire
L-histidine 7-amido-4-methylcoumarin Impurity CS-AD-00747 191723-64-5 Enquire
L-Histidine Benzyl Ester Impurity CS-T-26320 46921-20-4 Enquire
Na-Boc-L-histidine Impurity CS-T-07575 17791-52-5 Enquire
Na-Boc-L-histidine methyl ester Impurity CS-N-00474 2488-14-4 Enquire
N-Acetyl-L-histidine Impurity CS-T-30913 Not Available Enquire
N-Fmoc-1-trityl L-Homohistidine Impurity CS-T-74645 1324564-23-9 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-N-Methyl-L-histidine Intermediate CS-T-58260 368-16-1 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Histidine Fine Chemicals CS-T-26321 71-00-1 In Stock
L-Tyrosine Fine Chemicals CS-O-30962 60-18-4 In Stock
Nt-(tert-butoxycarbonyl)-L-histidine Fine Chemicals CS-O-49863 46924-53-2 Enquire
D-Histidine Fine Chemicals CS-DA-00245 351-50-8 Enquire
D-Histidine hydrochloride monohydrate Fine Chemicals CS-DA-00560 6341-24-8 Enquire
histidine tert-butyl ester Fine Chemicals CS-DV-03598 759432-08-1 Enquire
N-​(tert-​butoxycarbonyl)​-​3-​(phenylmethyl)​-​L-​histidine... Fine Chemicals CS-O-36073 109013-56-1 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-Nitroso-L-histidine Nitrosamine CS-O-46161 932446-62-3 Enquire
N-nitroso Histidine Nitrosamine CS-O-39121 ---- Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Histidine Secondary Standards CS-SS-24154-1GM 71-00-1 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Histidine-13C6 Stable Isotope Reagent CS-CH-00096 55443-59-9 Enquire
L-Histidine-13C6, A-Amine-15N Stable Isotope Reagent CS-CH-00097 620973-21-9 Enquire
L-Histidine-15N3 Stable Isotope Reagent CS-CH-00099 1217456-12-6 Enquire
L-Histidine-Amine-15N Stable Isotope Reagent CS-CH-00100 1202062-94-9 Enquire
1-Methyl-d3-L-histidine Stable Isotope Reagent CS-C-00862 91037-48-8 Enquire
DL-Histidine-alpha,beta,beta-d3 Stable Isotope Reagent CS-C-00533 344299-50-9 Enquire
DL-Histidine-α-15N Stable Isotope Reagent CS-T-95805 287484-37-1 Enquire
DL-Histidine-α,α,β,β-D3 Stable Isotope Reagent CS-C-00853 344299-50-9 Enquire
L-Histidine (Trt)-OH-15N3, Fmoc Stable Isotope Reagent CS-CH-00095 1217696-12-2 Enquire
L-Histidine-13C6,15N3 Stable Isotope Reagent CS-CH-00098 741656-40-6 Enquire
L-Histidine-d3 (α-d1, imidazole-2,5-d2) hydrochloride monohy... Stable Isotope Reagent CS-BX-01030 Not Available Enquire


Biochemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Histidine (base) for cell culture, 99%, Endotoxin (BET) 1E... Biochemicals CS-SR-00505 71-00-1 Enquire
L-Histidine Hydrochloride for cell culture, 99%, Endotoxin (... Biochemicals CS-SR-00506 5934-29-2 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-(Ethoxycarbonyl)-2-[(ethoxycarbonyl)thio]-N,N-dimethyl-L-h... Building Blocks CS-T-54306 162138-72-9 Enquire
1-(Triphenylmethyl)-N-(phenylmethylene)-L-histidine Methyl E... Building Blocks CS-T-45799 69937-82-2 Enquire
L-Valyl-L-histidine Building Blocks CS-T-46288 13589-07-6 Enquire
Na-Boc-D-histidine Building Blocks CS-T-07574 50654-94-9 Enquire
Na-Cbz-D-histidine Building Blocks CS-T-10675 67424-93-5 Enquire
Na-Cbz-L-histidine Building Blocks CS-T-10676 14997-58-1 Enquire
N-Acetyl-L-histidine Methyl Ester Building Blocks CS-T-64339 36097-48-0 Enquire


Polymers

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Poly(ethylene oxide)-b-poly(lactide)-b-poly(histidine), (a-m... Polymers CS-PM-01369 Not Available Enquire
Poly(L-histidine) Polymers CS-PM-00047 26062-48-6 Enquire
Poly(L-histidine), a,w-bis-(amino)-terminated Polymers CS-PM-01035 Not Available Enquire
Poly(styrene)-b-poly(ethylene oxide)-b-poly(histidine), w-am... Polymers CS-PM-01388 Not Available Enquire