How was Robert Burns Woodward awarded the Noble Prize?

Name: Robert Burns Woodward. 
Country: United States.
Date of Birth: 10 April 1917.
Date of Death: 8 July 1979.
The subject of Study: Cholesterol, cortisone, orbital, penicillin, and reaction mechanism.
Noble Prize Year: Nobel Prize for Chemistry in 1965 for his research and outstanding achievements in the art of organic chemistry.