Azaoxoaporphines are a class of heterocyclic compounds featuring an azaoxaphenazine ring system, which is characterized by the presence of nitrogen and oxygen atoms within its structure. These compounds exhibit unique electronic properties due to their conjugated systems, making them of interest in various applications including photochemistry, electrochemistry, and drug design. Azaoxoaporphines can serve as efficient photosensitizers for photodynamic therapy (PDT) owing to their ability to generate reactive oxygen species upon light excitation. They are also utilized in the development of luminescent materials due to their strong fluorescence properties under specific conditions. Additionally, these compounds have shown potential in catalytic reactions and as models for studying biological processes related to porphyrin-containing proteins.