Entecavir is an antiviral guanine analog that inhibits reverse transcription, DNA replication and transcription in the viral replication process. It is typically used to treat hepatitis B virus infection.
Identification of BMS-200475 as a potent and selective inhibitor of hepatitis B virus. 
Entecavir: a potent new antiviral drug for hepatitis B. 
A comparison of entecavir and lamivudine for HBeAg-positive chronic hepatitis B.