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Two new polyketides, palitantins B and C ( 1  and  2 ), along with one known related compound (+)-palitantin ( 3 ) were obtained from the culture of the Antarctic fungus  Geomyces  sp. 3-1. The structures of the new compounds were elucidated by detailed analysis of HRESIMS, NMR, CD, and ECD data. Compound  3  showed potent PTP1B inhibitory activity with an IC 50  value of 7.9  μ M (ursolic acid as positive control, IC 50  = 8.3  μ M).

Palitantin derivatives from the Antarctic fungus Geomyces sp. 3-1