The compounds were characterized as two
diketopiperazines, cyclo-L-Ala-L-Leu (1) [14] and cyclo(L-Tyr-L-Pro) (2) [15]; two nucleosides, cordycepin (3) and Ara-A(4) [16].
Diketopiperazines produced by an marine Bacillus species inhibits Vibrio parahaemolyticus.
Bauermeister et al., "A Simple Defined Medium for the Production of True
Diketopiperazines in Xylella Fastidiosa and Their Identification by Ultra-Fast Liquid Chromatography-Electrospray Ionization Ion Trap Mass Spectrometry," Molecules, vol.
Several PAI1 inhibitors have been found, including
diketopiperazines XR334, XR330 [12], XR1853, XR5082 [13], and XR5118 and ketopiperazines XR334, XR330 [12], XR1853, XR5082 [13], and XR5118 [14].
Both natural and synthetic
diketopiperazines have a wide variety of biological activities, including antitumor [55] (Nicholson et al.
By comparison with the published literature [7], this component was tentatively identified as
diketopiperazines of ampicillin.
Kittakoop et al., "New
diketopiperazines from the entomopathogenic fungus Verticillium hemipterigenum BCC1449," The Journal of Antibiotics, vol.
Citromycetins and bilains A-C: new aromatic polyketides and
diketopiperazines from Australian marine-derived and terrestrial Penicillium spp.
