Isocytosine
Also known as: 2-Amino-4-hydroxypyrimidine, 4-Hydroxy-2-aminopyrimidine, 2-Aminouracil, 2-Amino-4-pyrimidone, 2-Amino-6-hydroxypyrimidine, 2-Aminopyrimidin-4(1H)-one, 2-Aminopyrimidin-4(3H)-one, 2-Aminopyrimidin-4-ol, 4(1H)-Pyrimidinone, 2-amino-
Isocytosine (CAS 108-53-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H5N3O and a molecular weight of 111.102 g/mol. Key properties include a melting point of 275°C, a boiling point of 393.6±34.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 191.9±25.7 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed and H319 — Causes serious eye irritation. It is listed by 2 suppliers, 1 of which publish reference prices, from 5.20 to 220.00 CNY. Record last updated Aug 21, 2026.
- CAS No.
- 108-53-2
- Jingsj CID
- J-1994278-0
- Molecular Formula
- C4H5N3O
- Molecular Weight
- 111.102 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
In Stock | 98% 100g | ¥520.00 | $0.78 /gBest ¥5.20/g CNY | CN China MOQ 100g | |
In Stock | 99% 100g | ¥9,500.00 | $14.22 /g ¥95.00/g CNY | CN China MOQ 100g | |
In Stock | 99% 25g | ¥2,800.00 | $16.76 /g ¥112.00/g CNY | CN China MOQ 25g |
Physicochemical Properties
| Melting Point | 275°C |
|---|---|
| Boiling Point | 393.6±34.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 191.9±25.7 °C |
| Exact Mass | 111.043259 |
| PSA | 72.03000 |
| LogP | -1.01 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.668 |
| Storage Conditions | Room temperature. |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H319 — Causes serious eye irritation
Activity & Biological Data
| Additional Information | [1]. "Isocytosine". Molecule of the Week. American Chemical Society. Retrieved November 1, 2012. [2]. Hoshika S, et al. Hachimoji DNA and RNA: A genetic system with eight building blocks. Science. 2019 Feb 22;363(6429):884-887. |
|---|
Customs & Trade Information
| HS Code | 2933599090 |
|---|---|
| Summary | 2933599090. other compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of Isocytosine?
The CAS number of Isocytosine is 108-53-2.
What are the molecular formula and molecular weight of Isocytosine?
Isocytosine has molecular formula C4H5N3O and molecular weight 111.102 g/mol.
Which suppliers offer Isocytosine?
2 supplier(s) listed; reference unit price ¥5.20–220.00 /g.
Is Isocytosine hazardous?
Isocytosine has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H319 — Causes serious eye irritation.
What are the upstream and downstream products of Isocytosine?
For Isocytosine, Upstream Products: 1,3-Dimethyluracil, Guanidine hydrochloride, DL-Malic acid; Downstream Products: 2-Amino-4-chloropyrimidine, Uracil, 2-amino-5-bromopyrimidin-4(3H)-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Isocytosine (CAS 108-53-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1994278-0 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.