Deoxyadenosine is a deoxyribonucleoside
A deoxyribonucleoside is a type of nucleoside including deoxyribose as a component.An example is deoxycytidine....

. It is a derivative
Derivative (chemistry)
In chemistry, a derivative is a compound that is derived from a similar compound by some chemical or physical process. In the past it was also used to mean a compound that can be imagined to arise from another compound, if one atom is replaced with another atom or group of atoms, but modern...

 of the nucleoside
Nucleosides are glycosylamines consisting of a nucleobase bound to a ribose or deoxyribose sugar via a beta-glycosidic linkage...

 adenosine, differing from the latter by the replacement of a hydroxyl
A hydroxyl is a chemical group containing an oxygen atom covalently bonded with a hydrogen atom. In inorganic chemistry, the hydroxyl group is known as the hydroxide ion, and scientists and reference works generally use these different terms though they refer to the same chemical structure in...

 group (-OH) by hydrogen (-H) at the 2'
Nucleic acid nomenclature
Molecular biologists use several shorthand terms when referring to nucleic acid molecules, such as DNA and RNA, collectively referred to as nucleic acid nomenclature....

 position of its ribose
Ribose is an organic compound with the formula C5H10O5; specifically, a monosaccharide with linear form H––4–H, which has all the hydroxyl groups on the same side in the Fischer projection....

 sugar moiety
Moiety may refer to:* Moiety , a part or functional group of a molecule* Moiety , either of two groups into which a society is divided* An Australian Aboriginal kinship group* Native Hawaiian realm ruled by a Mo'i or Ali'i...

. Deoxyadenosine is the DNA nucleoside A, which pairs with deoxythymidine
Thymidine is a chemical compound, more precisely a pyrimidine deoxynucleoside. Deoxythymidine is the DNA nucleoside T, which pairs with deoxyadenosine in double-stranded DNA...

(T) in double-stranded DNA.
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