Used as a key intermediate in the synthesis of functional organic materials, particularly in the development of conjugated polymers and small-molecule semiconductors for organic electronics. Its aldehyde functional groups allow for easy incorporation into larger π-conjugated systems via condensation reactions, making it valuable in the design of dyes, sensors, and optoelectronic devices. The phenothiazine core contributes electron-donating properties and enhances charge transport, which is beneficial in applications such as organic light-emitting diodes (OLEDs) and photovoltaic cells. Additionally, derivatives built from this compound show potential in electrochromic materials and as fluorescent probes in biochemical imaging due to their tunable emission properties.