18906
Anti - influenza drugs , amantadine and rimantadine , targeting the M2 channel from influenza A virus are no longer effective because of widespread drug resistance .
 amantadine, rimantadine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 amantadine, rimantadine