Betaenone C, like other betaenones (A and B), is a secondary metabolite isolated from the fungus Pleospora betae, a plant pathogen.

[1] Of the seven phytotoxins isolated in fungal leaf spots from sugar beet (Beta vulgaris), it showed 89% growth inhibition.

Betaenone C has been shown to act by inhibiting RNA and protein synthesis.

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