The invention relates to compound of the formula (I) or its salt, in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are as defined in the description, their use of as medicament, the process for their preparation and use for the treatment of PDE-IV or TNF-.alpha. mediated diseases ##STR00001##

 
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> Treatment of arthritis with arsenoxide compounds

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