Benzopyran[4,3-d]thiazolderivate mit antiallergischer, anti-anaphylaktischer und anti-arthritischer Wirkung und diese enthaltende Zubereitungen

Compounds of formula (wherein R and R1 have the meanings reported in the specification) and their preparation are described. The compounds of formula I have anti-allergic, anti-anaphylactic and anti-arthritic activity and are useful in pharmaceutical field. Compositions for pharmaceutical use containing a compound of formula I as active ingredient are described too.