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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
C07D493/08—Bridged systems
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Chemical & Material Sciences
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Organic Chemistry
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Acyclic And Carbocyclic Compounds In Medicinal Compositions
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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