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

L-cysteine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(R,S)-N-Acetyl-S-(2-hydroxy-2-methyl-3-buten-1-yl)-L-cystein... Stable Isotopes CS-T-97063 Not Available Enquire
(R,S)-N-Acetyl-S-(2-hydroxy-3-methyl-3-buten-1-yl)-L-cystein... Stable Isotopes CS-T-94756 Not Available Enquire
cis-N-Acetyl-S-(4-hydroxy-2-buten-1-yl)-L-cysteine-d3 Stable Isotopes CS-T-94397 Not Available Enquire
D,L-Sulforaphane-d8 N-Acetyl-L-cysteine Sodium Salt Stable Isotopes CS-T-95530 334829-66-2(Unlabelled) Enquire
DL-Cysteine-3,3-d2 Stable Isotopes CS-T-102501 124051-54-3 Enquire
L-Homocysteine-3,3,4,4-d4 Stable Isotopes CS-T-102913 331665-12-4 Enquire
N-(Acetyl-d3)-S-(2-carboxyethyl)-L-cysteine Bis(dicyclohexyl... Stable Isotopes CS-T-94749 51868-61-2(Unlabelled) Enquire
N-(Acetyl-d3)-S-(2-carboxypropyl)-L-cysteine Ethyl Ester (Mi... Stable Isotopes CS-T-97065 Not Available Enquire
N-Acetyl-d3-S-(2-ethoxycarbonylethyl-1-methyl)-L-cysteine, D... Stable Isotopes CS-T-97064 33297-48-2 (Unlabelled) Enquire
N-Acetyl-S-(1,2-dichloroethenyl)-L-cysteine-13C,d3 Stable Isotopes CS-T-94344 Not Available Enquire
N-Acetyl-S-(2-carbamoylethyl-d4)-L-cysteine Stable Isotopes CS-O-15397 81690-92-8 (Unlabeled) Enquire
N-Acetyl-S-(2-carboxyethyl)-L-cysteine-13C3 Bis(dicyclohexyl... Stable Isotopes CS-T-97073 Not Available Enquire
N-Acetyl-S-(2-hydroxy-1-phenylethyl)-L-cysteine-13C6 + N-Ace... Stable Isotopes CS-T-94401 69278-53-1 + 14510-10-2- for unlabelled Enquire
N-Acetyl-S-(2-hydroxy-1-phenylethyl)-L-cysteine-d3 Sodium Sa... Stable Isotopes CS-T-94757 69278-53-1 + 14510-10-2(Unlabelled) Enquire
N-Acetyl-S-(2-hydroxy-3-but-3-en-1-yl)-L-Cysteine 1,2,3-13C3... Stable Isotopes CS-T-97060 Not Available Enquire
N-Acetyl-S-(2-hydroxy-3-propionamide)-L-cysteine-d3 Dicycloh... Stable Isotopes CS-T-94322 137698-08-9(unlabelled) Enquire
N-Acetyl-S-(3,4-dihydroxybutyl)-L-cysteine-13C4 (Mixture of ... Stable Isotopes CS-T-103125 144889-50-9(Unlabelled) Enquire
N-Acetyl-S-(3-hydroxypropyl-1-methyl)-L-cysteine-D3 Stable Isotopes CS-T-94755 100496-03-5(Unlabelled) Enquire
N-Acetyl-S-(4-hydroxy-2-buten-1-yl)-L-cysteine-d3 Stable Isotopes CS-T-94372 159092-65-6-unlabelled Enquire
N-Acetyl-S-(4-hydroxy-2-Methyl-2-trans-buten-1-yl)-L-cystein... Stable Isotopes CS-T-94394 2714414-67-0 Enquire
N-Acetyl-S-(4-hydroxy-3-methyl-2-trans-buten-1-yl)-L-cystein... Stable Isotopes CS-T-94373 Not Available Enquire
N-Acetyl-S-(carbamoylethyl)-L-cysteine-13C3 Stable Isotopes CS-T-97066 Not Available Enquire
N-Acetyl-S-(methylphenyl-13C6)-L-cysteine Stable Isotopes CS-T-95633 19542-77-9 (Unlabelled Enquire
N-Acetyl-S-(phenyl-13C6)-L-cysteine Stable Isotopes CS-T-95637 4775-80-8 Unlabelled Enquire
N-Acetyl-S-[2-hydroxy-1-(3-pyridinyl)ethyl]-L-cysteine-D3 Stable Isotopes CS-T-97841 Not Available Enquire
N-Acetyl-S-[2-hydroxy-2-(3-pyridinyl)ethyl]-L-cysteine-D3 Stable Isotopes CS-T-97842 Not Available Enquire
N-Acetyl-S-benzyl-2,3,4,5,6-d5-DL-cysteine Stable Isotopes CS-T-95198 19538-71-7(Unlabeled) Enquire
N-Acetyl-S-phenyl-d5-DL-cysteine Stable Isotopes CS-T-94761 20640-68-0(Unlabelled) Enquire
N-Acetyl-S-phenyl-DL-cysteine-3,3-d2 Stable Isotopes CS-T-94741 20640-68-0(Unlabelled) Enquire
S-(3-Hydroxypropyl)-L-cysteine-d6 Stable Isotopes CS-T-96928 Not Available Enquire
S-Phenyl-D5-L-cysteine Stable Isotopes CS-T-94378 34317-61-8(Unlabelled) Enquire
S-Phenyl-DL-cysteine-3,3-d2 Stable Isotopes CS-T-94742 5437-52-5(Unlabelled) Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Acetyl-S-(N-methylcarbamoyl)-L-cysteine Metabolite CS-T-00946 103974-29-4 Enquire
N-Acetyl-S-(trichlorovinyl)-L-cysteine Metabolite CS-T-01219 111348-61-9 In Stock


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Acetyl-S-(2-carboxyethyl)-L-cysteine Bis(dicyclohexylamine... Impurity CS-BI-00015 201666-27-5 In Stock
N-Acetyl-S-Phenyl-L-Cysteine Impurity CS-O-02393 4775-80-8 In Stock
Boc-L-cysteine Impurity CS-T-07414 20887-95-0 Enquire
L-Cysteine-D-penicillamine Disulfide Impurity CS-T-51548 18840-45-4 Enquire
N-Acetyl-S-(3,4-dihydroxybutyl)-L-cysteine Impurity CS-T-47215 144889-50-9 Enquire
S-Methyl-L-Cysteine-S-oxide Impurity CS-P-07570 6853-87-8 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cysteine Hydrochloride Fine Chemicals CS-O-30635 52-89-1 In Stock
N-Acetyl-S-(N-allylthiocarbamoyl)-L-cysteine Fine Chemicals CS-ED-42224 87321-45-7 Enquire
S-Allyl-L-cysteine Fine Chemicals CS-O-30769 21593-77-1 In Stock
captopril-cysteine Fine Chemicals CS-O-33583 75479-46-8 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cysteine hydrochloride monohydrate Building Blocks CS-AX-05984 7048-04-6 Enquire
N-Acetyl-S-benzyl-L-Cysteine Building Blocks CS-O-02001 19542-77-9 In Stock
S-Benzyl-L-cysteine Building Blocks CO-K-00002 3054-01-1 In Stock
γ-L-Glutamyl-L-cysteine Building Blocks CS-N-00388 636-58-8 Enquire
N-Propionyl-L-cysteine Building Blocks CS-T-40678 2885-79-2 Enquire


Peptide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
H-Cys(SO3H)-OH (E-3130.0025) Peptide CS-AX-06126 1637-71-4 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Acetyl-S-(3-hydroxypropyl)-L-cysteineDicyclohexylamine Sal... Stable Isotope Reagent CS-C-01655 14369-42-7 Enquire
N-Acetyl-S-(4-hydroxy-3-methyl-2-cis-buten-1-yl)-L-cysteine-... Stable Isotope Reagent CS-T-97061 2714472-63-4 Enquire