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C07D493/00—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system
C07D493/02—Heterocyclic compounds containing oxygen atoms as the only ring hetero atoms in the condensed system in which the condensed system contains two hetero rings
Verfahren zur Behandlung der Ablaugen, welche von der AEtznatronaufschliessung und den darauffolgenden Waschprozessen der verschiedenen Vegetabilien herstammen