21822
In our previous study , a series of 6 - aryl - 3 - amino - thieno [ 2 , 3 - b ] pyridine derivatives exhibited potent antiproliferative activities and an unique hepatocellular carcinoma ( HCC ) - specific anticancer activity was also observed .
 Chemical: 6 - aryl - 3 - amino - thieno [ 2 , 3 - b ] 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: 6 - aryl - 3 - amino - thieno [ 2 , 3 - b ] pyridine