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Priority claimed from US072170Aexternal-prioritypatent/US3906007A/en
Priority claimed from US05/072,171external-prioritypatent/US4146624A/en
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Publication of NL7112596ApublicationCriticalpatent/NL7112596A/xx
C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
C07D307/77—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom ortho- or peri-condensed with carbocyclic rings or ring systems