Wiktionary
hematoporphyrin
n. (context biochemistry English) The porphyrin portion of heme (minus the iron atom)
Wikipedia
Hematoporphyrin
Hematoporphyrin (Photodyn, Sensibion) is an endogenous porphyrin formed by the acid hydrolysis of hemoglobin. Nencki and Zaleski determined its chemical structure in 1900.
Hematoporphyrin has been used as an antidepressant and antipsychotic since the 1920s.