15659
But interestingly , a series of quaternary ammonium salts that were isolated as by - products during this synthetic work were found with high potency .
 Chemical: quaternary ammonium salts
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: quaternary ammonium salts