Used as a key intermediate in the synthesis of functional organic materials, particularly in the development of nonlinear optical materials and organic semiconductors. It serves as a building block for indigo-based dyes with tailored electronic properties, enabling applications in thin-film electronics and photovoltaic devices. Its extended conjugated structure supports use in dye-sensitized solar cells and as a chromophore in specialty pigments for high-performance coatings. Additionally, it finds application in research related to molecular switches and electrochromic systems due to its reversible redox behavior and strong visible light absorption.