Entry                                          score
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 C06767 Hemine                                                                 1.0000
 C00032 Heme                                                                   0.9796
 C03516 Magnesium protoporphyrin                                               0.9796
 C04536 Magnesium protoporphyrin monomethyl ester                              0.9522
 C02191 Protoporphyrin                                                         0.9309
 D02265 Protoporphyrin disodium                                                0.9309
 C11829 13(1)-Hydroxy-magnesium-protoporphyrin IX 13-monomethyl ester          0.9298
 C11830 13(1)-Oxo-magnesium-protoporphyrin IX 13-monomethyl ester              0.9261
 C11831 Divinylprotochlorophyllide                                             0.9011
 D05922 Stannsoporfin                                                          0.9000
 C02880 Protochlorophyllide                                                    0.8868
 C03184 Zinc protoporphyrin-9                                                  0.8654
 C21284 Fe-coproporphyrin III                                                  0.8459
 C05770 Coproporphyrin III                                                     0.8036
 C05009 Heme-thiolate                                                          0.8000