19303
It seemed that the introduction of electron - withdrawing groups on the imidazole ring enhanced the antiproliferative potential of these compounds ( compounds 27 , 29 and 31 ) .
 Chemical: imidazole
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: imidazole