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3,3'-(7,12-diethenyl-3,8,13,17-tetramethylporphyrin-2,18-diyl)dipropanoic acid

3-[(5Z,10Z,14Z,19Z)-18-(2-carboxyethyl)-8,13-bis(ethenyl)-3,7,12,17-tetramethyl-21,23-dihydroporphyrin-2-yl]propanoic acid

Journal of the American Chemical Society
Structural model for an alkaline form of ferricytochrome C.

simulated annealing in torsion angle space