porphyrinogen
/ˌpɔːfɪˈrɪnədʒ(ə)n/Chemistry
noun
Any of a group of colourless compounds which are reduced derivatives of porphin (and metabolic precursors of porphyrins) in which the four pyrrole nuclei are linked by methylene groups, —CH2.
Origin
Early 20th century; earliest use found in Journal of the Chemical Society. From porphyrin + -ogen, after German Porphyrinogen.