Natural Dibenzo[b,d]Pyran-6-Ones: Structural Diversity and Biological Activity

Natural dibenzo[b,d]pyran-6-ones are common and structurally diverse secondary metabolites that occur frequently in plants, fungi, lichens, and animal waste and possess broad spectra of biological activities such as cytotoxic, antioxidant, antifungal, and antimicrobial. The literature on the isolation, structural diversity, and biological activity of natural dibenzo[b,d]pyran-6-ones from 1949 to December 2014 was reviewed.