8025
Spiroimidazolidine - 2 , 4 - dione was in turn synthesized from norcamphor .
 Chemical: Spiroimidazolidine - 2 , 4 - dione; Chemical: norcamphor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Spiroimidazolidine - 2 , 4 - dione; Chemical: norcamphor