thymín

Thymine is one of the four nucleobases found in DNA. It is a pyrimidine derivative and is one of the four building blocks of nucleic acids, along with adenine, guanine, and cytosine. In DNA, thymine pairs specifically with adenine via two hydrogen bonds, forming a crucial part of the double helix structure. This specific pairing is fundamental to DNA replication and information storage. Thymine is not found in RNA; instead, uracil is used in its place, which also pairs with adenine. The structure of thymine consists of a six-membered ring with two nitrogen atoms and two carbonyl groups. It is also known as 5-methyluracil. The presence of the methyl group at the fifth position distinguishes it from uracil. Thymine plays a vital role in genetics and heredity.