Thymine

C₅H₆N₂O₂

IUPAC: 5-Methylpyrimidine-2,4(1H,3H)-dione

CAS: 65-71-4

概要

Thymine is a pyrimidine nucleobase found exclusively in DNA, where it pairs with adenine through two hydrogen bonds. It is distinguished from uracil (found in RNA) by having a methyl group at the 5 position. This methylation helps DNA repair enzymes distinguish DNA from RNA.

組成

元素 記号 原子 原子質量
Hydrogen H 6 1.0080
Carbon C 5 12.0110
Nitrogen N 2 14.0070
Oxygen O 2 15.9990

元素組成

H
Hydrogen ×6
4.8%
C
Carbon ×5
47.6%
N
Nitrogen ×2
22.2%
O
Oxygen ×2
25.4%

用途

  • • DNA component
  • • Genetic research
  • • Molecular biology
  • • UV mutation studies

豆知識

  • ✦ UV light can cause adjacent thymine bases to fuse into thymine dimers, a primary cause of skin cancer

安全性

  • ⚠ Low toxicity

Structure

SMILES

CC1=CNC(=O)NC1=O

特性

タイプ
organic
状態
solid
モル質量
126.12 g/mol
密度
1.2230 g/cm³
融点
316.0 °C
沸点
335.0 °C
溶解度
4.0 g/L at 25°C

Molecular Descriptors

Exact Mass
126.0429
XLogP
-0.6
TPSA
58.2 Ų
H-Bond Donors
2
H-Bond Acceptors
2
Rotatable Bonds
0
Heavy Atoms
9
Complexity
195.0

別名

5-Methyluracil

関連化合物

Caffeine

C₈H₁₀N₄O₂

Coumarin

C₉H₆O₂

Acetone

(CH₃)₂CO

Acrylic Acid

C₃H₄O₂

Cysteine

C₃H₇NO₂S

DDT

C₁₄H₉Cl₅

Alanine

C₃H₇NO₂

Diazepam

C₁₆H₁₃ClN₂O

Dichloromethane

CH₂Cl₂

Butane

C₄H₁₀

Frequently Asked Questions

What is Thymine?
Thymine (C₅H₆N₂O₂) is a organic compound with the IUPAC name 5-Methylpyrimidine-2,4(1H,3H)-dione.
What is the molecular weight of Thymine?
Thymine has a molar mass of 126.115 g/mol.
What state is Thymine at room temperature?
Thymine is a solid at room temperature.
Is Thymine organic or inorganic?
Thymine is classified as an organic compound.
What elements make up Thymine?
Thymine (C₅H₆N₂O₂) is composed of Hydrogen (H), Carbon (C), Nitrogen (N), Oxygen (O).