Journal of Natural Products 2018-Feb
Cybastacines A and B: Antibiotic Sesterterpenes from a Nostoc sp. Cyanobacterium.
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Abstracto
Cybastacines A (1) and B (2) were discovered as a novel pentacyclic sesterterpenoid-alkaloid skeleton structure, with a guanidinium group. These molecules were isolated from a Nostoc sp. cyanobacterium collected in the Canary Islands. Their structures were elucidated primarily by a combination of spectroscopic analyses and X-ray diffraction. These compounds showed antibiotic activities against several clinically relevant bacterial strains.