21591
Exploration of adenosine analogs in this class identified 1 ' - cyano - 2 ' - C - methyl 4 - aza - 7 , 9 - dideaza adenosine as a potent and selective inhibitor of NS5B .
 Chemical: adenosine; Chemical: 1 ' - cyano - 2 ' - C - methyl 4 - aza - 7 , 9 - dideaza adenosine
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: adenosine; Chemical: 1 ' - cyano - 2 ' - C - methyl 4 - aza - 7 , 9 - dideaza adenosine