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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 75233Generated: October 23, 2026

5-Bromocytosine

4-Amino-5-bromopyrimidin-2(1H)-one · 5-BROMOCYTOSINE · TIMTEC-BB SBB000280 · 5-Bromocytosine,99% · 5-BROMOCYTOSINE 99% · 5-Bromocytosine ,97% · 5-BROMOCYTOSINE CRYSTALLINE · 4-amino-5-bromo-pyrimidin-2-ol

https://huagongshe.com/en/chemical/75233

5-Bromocytosine molecular structure

Identifiers & Physical Properties

CAS No.2240-25-7
Molecular formulaC4H4BrN3O
Average molar mass190 g/mol
Monoisotopic mass188.95377385 g/mol
SMILESNc1[nH]c(=O)ncc1Br
InChIKeyQFVKLKDEXOWFSL-UHFFFAOYSA-N
PubChem CID75233
ChEMBLCHEMBL184965
EC No.218-806-8
DTXSIDDTXSID60176932

Chemical & Physical Properties

XLogP-0.3
Topological polar surface area67.5
Hydrogen bond donors2
Hydrogen bond acceptors2
Rotatable bonds0
Heavy atoms9
Formal charge0
Complexity208
Melting point240-243 °C (dec.) (lit.)
Density1.7513 (rough estimate)
Refractive index1.6520 (estimate)
Storage conditionsKeep in dark place,Sealed in dry,Room Temperature
SolubilitySoluble in formic acid (50 mg/ml).
Physical stateSolid
pKa (acidity coefficient)7.34±0.10(Predicted)
ColorWhite to yellow
BRN127286
InChIInChI=1S/C4H4BrN3O/c5-2-1-7-4(9)8-3(2)6/h1H,(H3,6,7,8,9)
InChIKeyQFVKLKDEXOWFSL-UHFFFAOYSA-N
SMILESC1(=O)NC(N)=C(Br)C=N1
FDA UNII2737MSZ714
NIST Chemistry Reference5-Bromocytosine(2240-25-7)
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS05,GHS07
Signal wordDanger
GHS hazard statementsH302-H315-H317-H318-H335
GHS precautionary statementsP261-P280-P305+P351+P338
Target organsRespiratory system
Hazard symbolsXn
Risk statements (R)22-37/38-41-43-48-20/21/22
Safety statements (S)24/25-22-36/37/39-26-45-7/8
Water hazard class (WGK)3
F10-23
Customs code29335990
Storage class11 - Combustible Solids
Hazard classAcute Tox. 4 OralEye Dam. 1Skin Irrit. 2Skin Sens. 1STOT SE 3

Safety & Regulations

GHS classificationDangerH302 (97.6%): Harmful if swallowed [Warning Acute toxicity, oral]P261, P264, P264+P265, P270, P271, P272, P280, P301+P317, P302+P352, P304+P340, P305+P354+P338, P317, P319, P321, P330, P332+P317, P333+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 41 reports by companies from 4 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesAcute Tox. 4 (97.6%)
F10-23
Water hazard class (WGK)3
Customs code29335990
Risk statements (R)22-37/38-41-43-48-20/21/22
Signal wordDanger
GHS pictogramGHS05,GHS07
Hazard symbolsXn
Safety statements (S)24/25-22-36/37/39-26-45-7/8
Storage class11 - Combustible Solids
Target organsRespiratory system
GHS hazard statementsH302-H315-H317-H318-H335
Hazard classAcute Tox. 4 OralEye Dam. 1Skin Irrit. 2Skin Sens. 1STOT SE 3
GHS precautionary statementsP261-P280-P305+P351+P338

Applications & Uses

Uses

4-Amino-5-bromo-2-hydroxypyrimidine can be used in the synthesis of cross-link products under anaerobic and aerobic conditions.

Uses

5-Bromocytosine was used in the synthesis of five cross-link products- C[5-N6]A, C[5-2]A, C[5-8]A, A[2-5]C, and A[8-5]C, under both aerobic and anaerobic conditions.

General Description

5-Bromocytosine derivative (β isomer) is a potent anti-HIV agent.