19018
The in vitro antiviral potency of 4d , e is 6 - 20 times greater than that of commercial rimantadine with lower EC50 values and higher therapeutic index .
 Chemical: rimantadine
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: rimantadine