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

Cystine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cystine dimethyl ester 15N2 D6 Stable Isotopes CS-O-45478 1069-29-0 (Unlabelled) Enquire
L-Cystine-15N2 Stable Isotopes CS-BX-03046 952407-61-3 Enquire
L-Cystine-S34 Stable Isotopes CS-O-51936 113512-08-6 Enquire
L-Cystine-S34 Stable Isotopes CS-O-40541 56-89-3 (Unlabeled) Enquire
DL-Cystine-2,2',3,3,3',3'-d6 Stable Isotopes CS-T-94125 352431-53-9 Enquire
DL-Cystine-3,3,3′,3′-d4 Stable Isotopes CS-O-35463 108641-83-4 Enquire
DL-Homocystine-3,3,3',3',4,4,4',4'-d8 Stable Isotopes CS-T-55673 108641-82-3 Enquire
L-Cystine-13C6,15N2 Stable Isotopes CS-T-73300 1252803-65-8 Enquire
N,N’-Diacetyl-L-cystine Bis(tert-Butyl) Diester-d6 Stable Isotopes CS-T-88729 1356382-52-9 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
D-Homocystine API CS-T-55671 6027-15-2 Enquire
DL-Homocystine API CS-T-78281 870-93-9 Enquire
L-Homocystine API CS-T-55675 626-72-2 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N,N,N',N'-Tetramethyl-L-cystine Dihydrochloride Impurity CS-T-61930 38254-66-9 Enquire
N,N’-Di-Boc-(L)-cystine-dimethyl Ester Impurity CS-T-52497 77826-55-2 Enquire
N,N'-Di-BOC-L-cystine Impurity CS-T-52496 10389-65-8 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cystine Fine Chemicals CS-O-11015 56-89-3 In Stock
L-Cystine Hydrochloride Fine Chemicals CS-O-15501 34760-60-6 In Stock
L-Selenocystine Fine Chemicals CS-DA-00414 29621-88-3 In Stock
D-Cystine Fine Chemicals CS-DA-00244 349-46-2 Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cystine Secondary Standards CS-SS-26671 56-89-3 Enquire
L-Cystine Secondary Standards CS-SS-24328-500MG 56-89-3 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Homocystine-3,3,3',3',4,4,4',4'-d8 Stable Isotope Reagent CS-C-01258 182755-41-5 Enquire


Biochemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cystine for tissue culture, 99% Biochemicals CS-SR-00064 56-89-3 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
L-Cystine Dimethyl Ester Building Blocks CS-EO-03287 1069-29-0 Enquire
L-cystine Dihydrochloride Building Blocks CS-AD-00774 30925-07-6 Enquire