Heterocyclic compounds containing rings having oxygen as the only ring hetero atoms according to more than one of the main groups [CPC: C07D303/00] - [CPC: C07D323/00]
Heterocyclic compounds containing rings having oxygen as the only ring hetero atoms according to more than one of the main groups [CPC: C07D303/00] - [CPC: C07D323/00]