[Lurkina.n.Learnin]

Lamivudine
http://en.wikipedia.org/wiki/Lamivudine

[Black Agnes]

It’s structurally related to favipiravir:

http://en.wikipedia.org/wiki/Favipiravir

Which is already being stockpiled in Japan for use in a flu outbreak:

http://www.japantimes.co.jp/news/2014/08/08/national/science-health/ebola-drug-japan-may-emerge-among-key-candidates/

And has been shown to halt ebola in the lab:

http://www.ncbi.nlm.nih.gov/pubmed/24462697

Japan has offered its stockpile of enough doses to treat 20K patients to the WHO. So far, crickets...