9561
Existing reactions , such as Staudinger ligation and the Huisgen 1,3 – dipolar cycloaddition , have been modified and optimized for such reaction conditions .
 person: Staudinger; person: Huisgen
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: Staudinger; person: Huisgen