Table 1. Natural Product DKPs and Their Biological Activities (DKP Core Structures are Highlighted in Bold).

Natural Product	Structure	Isolated from	Biological Activites	Ref.
Bicyclomycin		Streptomyces sp. (Gram-positive bacteria)	Antibiotic against Gram-negative and Gram-positive bacteria	[20, 21]
Brevicompanine		Penicillium brevicompactum (fungus)	Plant growth promoter	[22]
Chaetocochins		Chaetomium cochliodes (fungus)	Cytotoxins (target unknown)	[23]
Leptosins		Leptoshaeria (marine fungus)	Antitumor agents that inhibit DNA topoisomerases	[24]
MPC1001		Cladorrhinum sp. (fungus)	Antitumor antibiotic	[25]
Phenylahistin		Aspergillus ustus (fungus)	Mammalian cell cycle inhibitor	[26]
Rhodotorulic acid		Rhodotorula sp. (yeast)	Siderophore in E. coli	[27]
Verrucologens		Penicillium verruculosum (fungus)	Neurotoxins that block Ca2+-activated K+ channels	[28]