13999
Compounds 4b , 5a , 5b , 6a , 7e and 8d possessing 4 - fluorophenyl substituent at 2nd position of imidazo [ 1 , 2 - a ] pyridine ring displayed potent anticonvulsant activity without displaying any toxicity .
 Chemical: 4 - fluorophenyl; Chemical: imidazo [ 1 , 2 - a ] pyridine
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: 4 - fluorophenyl; Chemical: imidazo [ 1 , 2 - a ] pyridine