Used primarily in research settings as an intermediate for synthesizing biologically active phenothiazine derivatives. Shows potential in the development of antipsychotic and antihistaminic agents due to the structural characteristics of the phenothiazine core. Also investigated for its photochemical properties, making it useful in studies involving energy transfer and fluorescence. Not used in commercial pharmaceuticals or industrial applications due to limited stability and solubility. Mainly of interest in medicinal chemistry for structure-activity relationship studies.