<unk>  (symbol A or<unk>  is an organic compound that occurs widely in nature in the form of diverse derivatives. The molecule consists of an<unk> nine attached to a ribose via a β-N9-glycosidic bond.<unk>  is one of four nucleoside building blocks to DNA and RNA, which are essential for all life. Its derivatives include the energy carriers<unk>  mono-, di-, and triphosphate, also known as AMP/ADP/ATP. Cyclic<unk>  monophosphate (cAMP) is pervasive in signal transduction.<unk> nosyl <unk>  is the radical formed by removal of the 5′-hydroxy (OH) group.<unk>  is found in vitamin B12 and the radical SAM enzymes.<unk>  is also used as a medication.
Adenosine
Dobutamine
Adrenaline
Nortilidine
Norepinephrine 
Norepinephrine
Iofetamine 
Epinephrine 