| 摘要 |
The novel compounds of formula (I), wherein R<1> and R<2>, which are different, are each methyl, -C(O)-CH3 or -C(O)-OCH3 and whereby one of R<1> or R<2> is always methyl; and M is a physiologically acceptable counter cation, as well as processes for the preparation of said compounds, pharmaceutical compositions containing said compounds as active ingredient, and the use of the compounds in medicine. |
