22467
The anti hepatitis C virus ( HCV ) activity of ( + ) - lycoricidine ( 1 ) was evaluated for the first time in this letter , yielding an EC50 value of 0 . 55nmol / mL and an selection index ( SI ) value of 12 . 72 .
 ( + ) - lycoricidine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( + ) - lycoricidine