| http://www.w3.org/ns/prov#value | - Hydrophilic radicals R1 and R2, i.e. radicals which enable the compounds of the formula I to dissolve in water, are, for example, carboxyl and sulfoxy radicals and in particular salts thereof with any physiologically tolerable cations, such as the alkali metal salts or such as the trialkylammonium salts, such as tri(hydroxyalkyl)ammonium salts or the 2-methylpropan-1-ol-2-ammonium salts.
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