The Food and Drug Administration (FDA) is forecasting a funding opportunity for a cooperative agreement aimed at the synthesis and biological activity assessment of different diastereomers in the siRNA drug LEQVIO (Inclisiran). The primary objective of this research is to systematically evaluate the diastereomeric composition of LEQVIO, focusing on the synthesis of each diastereomer in stereochemically pure form and assessing their biological activity in inhibiting PCSK9 using in vitro assays and transgenic mouse models. This research is significant as it will enhance the understanding of the pharmacological activity of LEQVIO and contribute to the quality control of oligonucleotide drugs, with potential applications to other similar siRNAs. The award ceiling and floor for this opportunity are both set at $300,000, with one expected award to be made. Interested applicants can reach out to Terrin Brown at terrin.brown@fda.hhs.gov or by phone at (240) 402-7610 for further information.