21H,23H-porphine-2,18-dipropanoic acid, 7,12-diethenyl-3,8,13,17-tetramethyl-, manganese(2+) salt (1:1);manganese(2+) 2,18-bis(2-carboxyethyl)-7,12-diethenyl-3,8,13,17-tetramethylporphine-21,23-diide
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