several porphyrins were investigated and ranked by the intensity of their esr spectra ( coproporphyrin iii greater than coproporphyrin i greater than deuteroporphyrin ix greater than mesoporphyrin ix greater than photofrin ii greater than protoporphyrin ix greater than uroporphyrin i greater than uroporphyrin iii greater than hematoporphyrin ix ) .
C0032712
porphyrins
C0033733
protoporphyrin ix