Some derivatives of glutathione

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Abstract
The sulphinic acid (GSO2H) from glutathione, prepared by fission of GSSG with silver salts, has been isolated. The sulphonic acid (GSO3H) from glutathione, prepared by oxidation of GSH with performic acid, has also been isolated. The preparation of the thiosulphonate, GSO2[center dot]SG, has been attempted by oxidation of GSSG with monoperphthalic acid; the unstable product, which could not be purified, showed the reactions expected of GSO2[center dot]SG. The infrared spectrum and titration constants of ophthalmic acid are discussed.
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