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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
C07D493/04—Ortho-condensed systems
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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CH278587D1948-12-301949-08-12Verfahren zur Herstellung des Bis-(4-hydroxy-cumarinyl)-essigsäurelactons.
CH278587A
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