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A **small molecule experimental antiviral compound** containing two 1,3-diazocyclopenta-2,4-dien-4-yl (potentially imidazole-related) groups linked via ethyl diamide bridges to malonic acid. It is primarily referenced as "XC9" and is investigated as part of a **combination therapy** in clinical trials for the treatment of **influenza** and **respiratory syncytial virus (RSV) infection**. The compound appears only in combination with another agent (imidazolylethylamide of pentanedioic acid) in clinical trial protocols, not as a monotherapy. Its mechanism of action is not detailed in the publicly available sources. The compound is at an early stage of clinical development and is not an approved pharmaceutical.
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