21586
Discovery of the First C - Nucleoside HCV Polymerase Inhibitor ( GS - 6620 ) with Demonstrated Antiviral Response in HCV Infected Patients .
 Chemical: C - Nucleoside; Chemical: GS - 6620
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: C - Nucleoside; Chemical: GS - 6620