How was Paul D. Boyer awarded the Nobel Prize?

Name: Paul D. Boyer. 
Country: United States.
Date of Birth: 31 July 1918.
Died: 2 June 2018.
The subject of Study: Adenosine triphosphate.
Noble Prize Year: Nobel Prize for Chemistry in 1997 for their research on the enzymatic process involved in the production of the energy-storage molecule adenosine triphosphate (ATP).