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2-Amino-5-methylpyrimidin-4(3H)-one

Also known as: 5-Methylisocytosine, 2-Amino-5-methyl-4-pyrimidinol, 2-Amino-5-methyl-1H-pyrimidin-6-one, 2-Amino-5-methyl-3H-pyrimidin-4-one, 2-Amino-5-methyl-4(3H)-pyrimidinone, 4(3H)-Pyrimidinone, 2-amino-5-methyl-, NSC 60208

2-Amino-5-methylpyrimidin-4(3H)-one (CAS 15981-91-6) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H7N3O and a molecular weight of 125.129 g/mol. Key property: a density of 1.4±0.1 g/cm3. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.
15981-91-6
Jingsj CID
J-1473148-7
Molecular Formula
C5H7N3O
Molecular Weight
125.129 g/mol
Category
Pharma Intermediates
Last updated
8/21/2026
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Physicochemical Properties

Density1.4±0.1 g/cm3
Exact Mass125.058914
PSA71.77000
LogP-0.40
Refractive Index1.651

GHS Safety & Compliance

Corrosion / IrritantSignal word: Danger
  • H302 — Harmful if swallowed
  • H318 — Causes serious eye damage

Frequently Asked Questions

What is the CAS number of 2-Amino-5-methylpyrimidin-4(3H)-one?

The CAS number of 2-Amino-5-methylpyrimidin-4(3H)-one is 15981-91-6.

What are the molecular formula and molecular weight of 2-Amino-5-methylpyrimidin-4(3H)-one?

2-Amino-5-methylpyrimidin-4(3H)-one has molecular formula C5H7N3O and molecular weight 125.129 g/mol.

Is 2-Amino-5-methylpyrimidin-4(3H)-one hazardous?

2-Amino-5-methylpyrimidin-4(3H)-one has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H318 — Causes serious eye damage.

What are the upstream and downstream products of 2-Amino-5-methylpyrimidin-4(3H)-one?

For 2-Amino-5-methylpyrimidin-4(3H)-one, Upstream Products: methyl formate, Guanidine hydrochloride, Ethyl propionate; Downstream Products: Thymine, 4-Chloro-5-methylpyrimidin-2-amine.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated:

How to cite: Jingsj. "2-Amino-5-methylpyrimidin-4(3H)-one (CAS 15981-91-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1473148-7 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.