23782
PURPOSE : Paraquat ( PQ ; 1 , 1 ' dimethyl - bipyridilium 4 , 4 ' - dichloride ) , which is used extensively throughout the world , is highly toxic to humans .
 Chemical: Paraquat; Chemical: 1 , 1 ' dimethyl - bipyridilium 4 , 4 ' - dichloride
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: Paraquat; Chemical: 1 , 1 ' dimethyl - bipyridilium 4 , 4 ' - dichloride