1 HNN Porphycene containing Mn 1.000 2 HME Porphycene containing Fe 0.955 3 76R [3,3',3'',3'''-(3,8,13,17-tetramethylporphyrin-2,7,12,18-tetrayl-kappa~4~N~21~,N~22~,N~23~,N~24~)tetra(propanoato)(2-)]manganese 0.736 4 MNH Manganese protoporphyrin ix 0.720 5 MNR Protoporphyrin ix containing Mn 0.720