22915
Similar trend of antagonism was shown by phenobarbitone when it was subjected to the challenge of AchE with aKm and aVm values of 51 . 99 % and 71 . 80 % , respectively .
 Chemical: phenobarbitone
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: phenobarbitone