Adenosine
= Adenosine
{wiki}
<Adenosine> consists of <adenine> joined to <ribose>. Adding one, two, or three <phosphate> groups at the <ribose>'s $5'$ position gives <AMP>, <ADP>, or <ATP>, respectively. See https://www.ncbi.nlm.nih.gov/books/NBK26883/[Alberts et al., Molecular Biology of the Cell: the components of nucleotides].