7984
It was named by scientists John W. Daly and Bernhard Witkop , who separated the potent toxic alkaloids fraction and determined its chemical properties .
 person: John W. Daly; person: Bernhard Witkop
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: John W. Daly; person: Bernhard Witkop