14955
Thiamine and benfotiamine are vitamin B1 and pro - vitamin B1 substances , respectively .
 Chemical: Thiamine; Chemical: benfotiamine; Chemical: vitamin B1; Chemical: pro - vitamin B1
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: Thiamine; Chemical: benfotiamine; Chemical: vitamin B1; Chemical: pro - vitamin B1