Trecovirsen sodium is a 25-mer antisense phosphorothioate oligonucleotide targeted at the gag site of the HIV gene.
References:
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[2]. Pedziwiatr-Werbicka E, Fuentes E, Dzmitruk V, et al. Novel 'Si-C' carbosilane dendrimers as carriers for anti-HIV nucleic acids: studies on complexation and interaction with blood cells. Colloids Surf B Biointerfaces. 2013;109:183-189.