C07D 491/22

Heterocyclic compounds containing in the condensed ring system both one or more rings having oxygen atoms as the only ring hetero atoms and one or more rings having nitrogen atoms as the only ring hetero atoms, not provided for by groups [CPC: C07D451/00] - [CPC: C07D459/00], [CPC: C07D463/00], [CPC: C07D477/00] or [CPC: C07D489/00] in which the condensed system contains four or more hetero rings