Bepirovirsen (ISIS 505358) sodium is an antisense oligonucleotide targeting all HBV messenger RNAs. Bepirovirsen sodium leads to reductions in HBV-derived RNAs, HBV DNA and viral proteins. Bepirovirsen sodium can be used for the research of chronic HBV infection. Bepirovirsen sodium binding site sequence (GCACTTCGCTTCACCTCTGC).