Name: Products List
Brand: Clearsynth
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Contact Info

17, Lotus Business Park,
Andheri West, Mumbai - 400 053, India
+1-415-685-4395
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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

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
Desfuroyl Ceftiofur Cysteine Disulfide-d3 (>85%)	Stable Isotopes	CS-T-94869	158039-15-7 (Unlabelled)	Enquire
D-Homocysteine-d4	Stable Isotopes	CS-T-96938	Not Available	Enquire
DL-Cysteine-3,3-d2	Stable Isotopes	CS-T-102501	124051-54-3	Enquire
DL-Homocysteine-d4	Stable Isotopes	CS-I-00652	416845-90-4	Enquire
Homocysteine-cysteine Disulfide-d4	Stable Isotopes	CS-T-100244	Not Available	Enquire
L-Cysteine-3,3-d2	Stable Isotopes	CS-T-94037	130633-02-2	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-d3-S-(3-hydroxypropyl)cysteine, Dicyclohexylammoniu...	Stable Isotopes	CS-T-94336	1356934-09-2	Enquire
N-Acetyl-S-(1,2-dichloroethenyl)-L-cysteine-13C,d3	Stable Isotopes	CS-T-94344	Not Available	Enquire
N-Acetyl-S-(2,4-dimethylbenzene)cysteine-d3 (R/S Mixture)	Stable Isotopes	CS-T-94754	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-1,1,2,2,3,3-D6)cysteine, Dicyclo...	Stable Isotopes	CS-T-94763	Not Available	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-Methyl-L-cysteine Sulfoxide-d3	Stable Isotopes	CS-T-102871	6853-87-8(Unlabelled)	Enquire
S-(3-Hydroxypropyl)-L-cysteine-d6	Stable Isotopes	CS-T-96928	Not Available	Enquire
S-(5'-Adenosyl)-L-homocysteine-13C5	Stable Isotopes	CS-T-96657	979-92-0(Unlabelled)	Enquire
S-(5'-Adenosyl)-L-homocysteine-d4	Stable Isotopes	CS-T-102733	979-92-0(Unlabelled)	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

API

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
L-Homocysteine	API	CS-T-26351	6027-13-0	In Stock
Cysteinylcysteine	API	CS-O-15567	18048-87-8	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
(1-chloro-4-hydroxyisoquinoline-3-carbonyl)cysteine	Impurity	CS-O-46711	Not Available	Enquire
(S)-Dimethenamid Hydroxycysteine adduct	Impurity	CS-O-47001	Not Available	Enquire
(S)-Dimethenamid Hydroxycysteine Sulfoxide impurity	Impurity	CS-O-47002	Not Available	Enquire
Acetylcysteine EP Impurity C	Impurity	CS-O-10965	5545-17-5	In Stock
Acetylcysteine EP Impurity C Disodium salt	Impurity	CS-EO-03221	1376779-04-2	Enquire
Acetylcysteine EP Impurity D	Impurity	CS-O-07120	18725-37-6	In Stock
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
S-(5'-Adenosyl)-L-homocysteine	Impurity	CS-T-47465	979-92-0	In Stock
Tiopronin-Cysteine Disulfide	Impurity	CS-O-54396	77591-18-5	Enquire
Boc-L-cysteine	Impurity	CS-T-07414	20887-95-0	Enquire
DL-Homocysteine	Impurity	CS-O-14098	454-29-5	Enquire
DL-Homocysteine Thiolactone	Impurity	CS-P-07516	10593-85-8	Enquire
L-Cysteine-D-penicillamine Disulfide	Impurity	CS-T-51548	18840-45-4	Enquire
Mecysteine Hydrochloride	Impurity	CS-T-31677	18598-63-5	Enquire
N,S-Carboxymethyl Cysteine Hydrochloride	Impurity	CS-P-07562	907565-13-3(Free base)	Enquire
N-Acetyl-D-cysteine	Impurity	CS-T-64240	26117-28-2	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

Intermediate

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
S-Acetylcysteine	Intermediate	CS-O-52775	60333-15-5	Enquire

Fine Chemicals

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
Carbocysteine lysine monohydrate	Fine Chemicals	CS-ED-00454	151756-26-2	In Stock
L-Cysteine Hydrochloride	Fine Chemicals	CS-O-30635	52-89-1	In Stock
L-Cystine	Fine Chemicals	CS-O-11015	56-89-3	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
Cysteine hydrochloride monohydrate	Fine Chemicals	CS-DA-00242	96998-61-7	Enquire
N-Formylcysteine	Fine Chemicals	CS-ED-00981	19538-78-4	Enquire
N-methylcysteine	Fine Chemicals	CS-ED-00980	4026-48-6	Enquire

Nitrosamine

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
N-Nitroso Acetylcysteine	Nitrosamine	CS-EO-02608	----	Enquire

Stable Isotope Reagent

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
Cysteine methyl ester-13C3 15N	Stable Isotope Reagent	CS-O-45531	2485-62-3 (Unlabelled)	Enquire
DL-Homocysteine Thiolactone-3,3,4,4-d4	Stable Isotope Reagent	CS-C-01999	1219805-31-8	Enquire
Homocysteine-13C4,15N	Stable Isotope Reagent	CS-T-103967	6027-13-0(unlabelled)	Enquire
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

Therapeutic

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
Acetylcysteine EP Impurity B	Therapeutic	CS-O-07118	52-90-4	In Stock

Building Blocks

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
D-Cysteine Methyl Ester	Building Blocks	CS-O-44510	88806-98-8	Enquire
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

Chiral

COMPOUND	CATEGORY	CAT. No.	CAS. No.	STOCK STATUS
(RS)-carbocysteine lactam	Chiral	CS-DH-00010	14226-97-2	In Stock
S-[2-[(1-iminoethyl)amino]ethyl]-L-Homocysteine	Chiral	CS-P-07565	210354-22-6	Enquire