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In turn , two 8 , 8 - dialkylcanadines , obtained by reduction of the corresponding 8 , 8 - DDBs , were much less potent against these parasites in vitro .
 Chemical: 8 , 8 - dialkylcanadines; Chemical: 8 , 8 - DDBs
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: 8 , 8 - dialkylcanadines; Chemical: 8 , 8 - DDBs