H 9326 (OTTO) Hygromycin B, from Streptomyces hygroscopicus, plant cell culture tested, ≥60% (HPLC), lyophilized powder Cas 31282-04-9 - used to study protein synthesis at the level of the 70S ribosome translocation and mRNA template misreading, as an antiviral agent by selectively penetrating cells rendered permeable by virus infection and inhibiting translation.