The compound with CAS number 168110-44-9 is a key synthetic intermediate in the production of micafungin sodium, a semisynthetic echinocandin antifungal agent. Micafungin is a potent and broad-spectrum antifungal drug used clinically to treat serious fungal infections, particularly invasive candidiasis and aspergillosis, by non-competitively inhibiting the synthesis of 1,3-β-D-glucan, an essential component of the fungal cell wall. This intermediate is a crucial building block in the complex multi-step synthesis of micafungin. Its structure is integral to forming the core cyclic hexapeptide framework of the final active pharmaceutical ingredient (API). The synthesis and purification of this intermediate are critical steps that directly impact the overall yield, purity, and cost-effectiveness of manufacturing the final drug substance. As a dedicated pharmaceutical intermediate, its primary and almost exclusive industrial application is in the synthesis of the antifungal API, micafungin. It is not a general-purpose chemical reagent or building block for other applications, underscoring its specialized role in the pharmaceutical supply chain for this specific antifungal medication.