Used primarily in organic synthesis, it serves as a key intermediate for the preparation of various phenothiazine derivatives, which are important in the pharmaceutical industry. It is particularly valuable in the development of antipsychotic drugs, where phenothiazine-based compounds are utilized for their neuroleptic properties. Additionally, it finds application in the synthesis of dyes and pigments due to its ability to form stable, colored complexes. In research, it is employed to study the chemical behavior and reactivity of phenothiazine compounds, aiding in the discovery of new therapeutic agents and materials.