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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-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-Carboxycytosine-13C,15N2 Stable Isotopes CS-T-100685 Not Available Enquire
5-Fluoro Cytosine-13C,15N2 Stable Isotopes CS-O-11263 1216616-31-7 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
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
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


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2RS,5R)-5-(cytosine-1-yl)-1,3-oxathiolane-2-carboxylic acid Impurities CS-O-36296 2166343-24-2 Enquire
2-Deoxy-D-β-ribopyranosyl-5-azacytosine Impurities CS-T-73472 157771-78-3 Enquire
5-azacytosine dipentose Impurities CS-O-35888 2306050-23-5 Enquire
5-Methyl Cytosine Hydrochloride Impurities CS-T-80226 58366-64-6 Enquire
6-methyl-5-azacytosine pentose Impurities CS-O-35889 105330-94-7 Enquire
Flucytosine Imp at RRT 0.7 Impurities CS-O-47894 Not Available Enquire
Gemcitabine Cytosine Impurities CS-DN-00011 Not Available Enquire
Iso Cytosine Impurities CS-T-29710 108-53-2 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1-(2'-Chloro-2'-deoxy-β-D-arabinofuranosyl)cytosine Intermediates CS-N-00141 58461-30-6 Enquire
1beta-D-Arabinofuranosyl-5-methylcytosine Intermediates CS-ED-11610 6829-31-8 Enquire
1-Methylcytosine Intermediates CS-ED-12109 1122-47-0 Enquire
2,4-Dichloro-5-fluoropyrimidine Intermediates CS-M-07582 2927-71-1 Enquire
5-(Hydroxymethyl)cytosine Intermediates CS-T-27679 1123-95-1 Enquire
5-CHLOROCYTOSINE Intermediates CS-DL-00200 2347-43-5 Enquire
5-Hydroxycytosine Intermediates CS-T-26946 13484-95-2 Enquire
5-Iodocytosine Intermediates CS-ED-05833 1122-44-7 Enquire
5-Methylisocytosine Intermediates CS-ED-10312 15981-91-6 Enquire
6-Chlorocytosine Intermediates CS-ED-04910 3289-35-8 Enquire
Cyclopentenylcytosine Intermediates CS-T-73700 90597-22-1 Enquire
Cytosine beta-D-Arabinofuranoside Hydrochloride Intermediates CS-T-73746 69-74-9 Enquire
N4-Acetylcytosine Intermediates CS-DE-00937 14631-20-0 In Stock


Glucuronides

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Fluoro Cytosine O-β-D-Glucuronide Glucuronides 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
5-Formylcytosine Fine Chemicals CS-T-77473 4425-59-6 Enquire
N4-Benzoylcytosine Fine Chemicals CS-O-11262 26661-13-2 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Fluoro Cytosine Building Blocks CS-O-04356 2022-85-7 Enquire
Cytosine Building Blocks CS-O-01189 71-30-7 In Stock
Cytosine arabinoside 5'-triphosphate Building Blocks CS-ED-41854 13191-15-6 Enquire