How was John Warcup Cornforth awarded the Noble Prize?

Name: John Warcup Cornforth. 
Country: Australia.
Date of Birth: 7 September 1917.
Date of Death: 8 December 2013.
The subject of Study: Chemical compound.
Noble Prize Year: Nobel Prize for Chemistry in 1975 for theirresearch on the stereochemistry of enzyme-catalyzed reactions.