发明授权
US5439909A New substituted benzodioxins 失效
新取代的苯并二恶英

New substituted benzodioxins
摘要:
A compound of formula (I): ##STR1## wherein: X represents O, S or H.sub.2,R and R' each represents hydrogen or together form a bond,R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are as defined in the description.useful in the treatment or prevention of disorders involving oxidative processes.
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