<unk>  (Photodyn, Sensibion) is a porphyrin prepared from hemin. It is a derivative of protoporphyrin IX, where the two vinyl groups have been hydrated (converted to alcohols). It is a deeply colored solid that is usually encountered as a solution. Its chemical structure was determined in 1900. It is used as a photosensitizer in photodynamic therapy. Acetylation of<unk>  followed by hydrolysis of the product of that reaction affords a mixture called<unk>  derivative <unk> D), which is also used in photodynamic therapy.<unk>  has also been used as an antidepressant and antipsychotic since the 1920s.
Hematoporphyrin
Hemichrome
Fosdenopterin
Neurite
Hemoglobin
Melanin
Cellulite
Lipochrome