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

Cytosine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Deoxy-D-β-ribopyranosyl-5-azacytosine-15N4 Stable Isotopes CS-T-100540 Not Available Enquire
5-(Hydroxymethyl)cytosine-d2,13C Stable Isotopes CS-T-100199 Not Available Enquire
5-Carboxycytosine-13C,15N2 Stable Isotopes CS-T-100685 Not Available Enquire
5-Fluoro Cytosine-13C,15N2 O-β-D-Glucuronide Stable Isotopes CS-T-98459 Not Available Enquire
5-Formylcytosine-13C,15N2 Stable Isotopes CS-T-100284 Not Available Enquire
Cytosine-13C,15N2 Stable Isotopes CS-T-95685 181517-10-2 In Stock
Cytosine-5,6-d2 Stable Isotopes CS-T-94776 106391-24-6 Enquire
Cytosine-amino-15N Stable Isotopes CS-O-39894 3920-45-4 Enquire
Flucytosine15NH2 Stable Isotopes CS-O-46790 Not Available Enquire
5-Aza Cytosine-15N4 Stable Isotopes CS-T-95798 1189895-68-8 Enquire
5-Azacytosine 13C,15N2 Stable Isotopes CS-T-51561 931-86-2 (Unlabelled) Enquire
5-Fluoro Cytosine-13C,15N2 Stable Isotopes CS-O-11263 1216616-31-7 Enquire
5-Hydroxycytosine-13C, 15N2 Stable Isotopes CS-T-79233 181516-92-7 Enquire
5-Methyl Cytosine-13C,15N2 Hydrochloride Stable Isotopes CS-T-80070 1246815-59-7 Enquire
5-Methyl-d3-cytosine-6-d1 Stable Isotopes CS-C-01043 554-01-8 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Fluoro Cytosine API CS-O-04356 2022-85-7 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethoxy-5-fluoro-4(3H)-pyrimidinone Impurity CS-T-22372 56177-80-1 In Stock
Flucytosine Imp at RRT 0.7 Impurity CS-O-47894 Not Available Enquire
Lamivudine Carboxylic Impurity Impurity CS-O-36296 2166343-24-2 Enquire
2-Deoxy-D-β-ribopyranosyl-5-azacytosine Impurity CS-T-73472 157771-78-3 Enquire
4-Chloro-5-fluoro-2-methoxypyrimidine Impurity CS-DV-02730 1801-06-5 Enquire
5-azacytosine dipentose Impurity CS-O-35888 2306050-23-5 Enquire
5-Methyl Cytosine Hydrochloride Impurity CS-T-80226 58366-64-6 Enquire
6-methyl-5-azacytosine pentose Impurity CS-O-35889 105330-94-7 Enquire
Bis(trimethylsilyl)-5-azacytosine Impurity CS-O-41047 52523-35-0 Enquire
Gemcitabine Cytosine Impurity CS-DN-00011 Not Available Enquire
Iso Cytosine Impurity CS-T-29710 108-53-2 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N4-Acetylcytosine Intermediate CS-DE-00937 14631-20-0 In Stock


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Fluoro Cytosine O-β-D-Glucuronide Glucuronide CS-T-77118 150494-26-1 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Azacytosine Fine Chemicals CS-O-00881 931-86-2 In Stock
N4-Benzoylcytosine Fine Chemicals CS-O-11262 26661-13-2 In Stock
5-Formylcytosine Fine Chemicals CS-T-77473 4425-59-6 Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Cytosine Secondary Standards CS-SS-24355-500MG 71-30-7 Enquire
Flucytosine Secondary Standards CS-SS-24617-1GM 2022-85-7 Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Cytosine-2,4-13C2,15N3 Stable Isotope Reagent CS-ZH-21093 285978-06-5 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Cytosine Building Blocks CS-O-01189 71-30-7 In Stock
Cytosine arabinoside 5'-triphosphate Building Blocks CS-ED-41854 13191-15-6 Enquire