93324
Early industrial routes started from furfural and later by the chlorination of butadiene to give 1,4-dichloro-2-butene , which with sodium cyanide , converts to 3-hexenedinitrile , which in turn can be hydrogenated to adiponitrile : Adiponitrile has also been produced from adipic acid , by dehydration of the diamide , but this route is rarely employed .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None