Phenoxazine is a heterocyclic compound that is widely used in medicinal chemistry for the synthesis of various bioactive molecules. It is also an important starting material for the synthesis of dyes, pigments, and fluorescent probes. However, there are many synonyms for the term "phenoxazine." These include 9-Phenylphenoxazine, 10H-Phenoxazine, Dibenzo[b,g][1,4]oxazine, Dibenzo[b,g][1,4]thiazine, and Oxanthrazine. These synonyms all refer to different variations of the phenoxazine structure. They are used in different fields of research and have their unique properties and applications, making them valuable tools in the sciences.