Structure and antiviral activity of arabinogalactan with (1→6)-β-d-galactan core from Stevia rebaudiana leaves

► Arabinogalactans with unusual main chain was isolated from Stevia rebaudiana leaves. ► The arabinogalactans have (1→6)-β-d-galactan main chain. ► The polysaccharide showed antiviral activity against Herpes Simplex Virus in vitro.