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C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
C07D498/04—Ortho-condensed systems
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Chemical & Material Sciences
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Organic Chemistry
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Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems
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Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms
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Pharmaceuticals Containing Other Organic And Inorganic Compounds
(AREA)