| http://www.w3.org/ns/prov#value | - of the formula I [0011] or a physiologically tolerable salt of the compound of the formula I, [0012] where R1, R2 and R3, which are identical or different, are a hydrogen atom or alkyl having 1 to 4 carbon atoms, and R4 is a saturated hydrocarbon radical having 6 to 9 carbon atoms. [0013] A preferred pharmaceutical preparation is one where [0014] R4 is a saturated hydrocarbon having 6 to 9 carbon
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