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This is provided heterotropically by ingestion of organo- S -compounds, which were produced originally by the sulfate-reducing organisms

ligands selected from the group consisting of: glutathione (GSH or gamma-glutamylcysteinylglycine), S-(p-bromobenzyl)glutathione, gamma-(L-gamma-azaglutamyl)-S-(p-bromobenzyl)-L-c y s t e i n y l g l y c i n , S- Butylglutathione, S-Decylglutathione, Glutathione reduced ethyl ester, Glutathionesulfonic acid, S-Hexylglutathione, S-Lactoylglutathione, S- Methylglutathione, S-(4-Nitrobenzyl)glutathione, S-Octy Ri and R 2 are independently selected from the group consisting of H, linear or branched alkyl (1-25C), aralkyl (6-26C), cycloalkyl (6-25C), heterocycles (6-20C), ethers or polyethers (3-25C), and where Ri-R 2 together have 2-20C atoms and form a macrocycle with the remainder of formula I

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