• Porphyrin
• Porphine
• Hexahydroporphine
• 2,5-Bis(hydroxymethyl)pyrrole
https://royalsocietypublishing.org/doi/10.1098/rspb.1939.0013
• Hydroxymethylbilane
• Heme
• Uroporphyrinogen_III
• Protoporphyrin_IX

References

• Gilber Seely thesis on photochemistry
• Hypocholophyll
• Molecular orbitals of porphyrins
https://pubs.rsc.org/en/content/articlelanding/1957/jr/jr9570003461/unauth#!divAbstract@Novel hydroporphyrins
• Attempt tetrahydroporphine
• isomers of tetrahydroporphin
• Electron model of porphine and TH porphine
• Orbitals porphine and TH porphine
• Iron TH porphyrin
• GoogleScholar HH prophin
• Luminescence of TH porphin in octane
https://link.springer.com/article/10.1007%2FBF00657464?LI=true Absorption spectrum of TH porphine
• Free electrons of porphine and TH porphine
https://royalsocietypublishing.org/doi/10.1098/rspb.1939.0013@@Turacin, copper pigment of turaco feathers