Endophytic fungi Athelia rolfsii have been isolated from the bark of the plant Sterculia quadrifida R.Br, endophytic fungi produce flavonoid compounds with the name pinostrobin. Identification of the structure of flavonoid compounds using HR-ESI-MS, IR, 1H-NMR, 13C-NMR, and HMQC data. The cytotoxic activity of the compound was evaluated using an in vitro MTT assay on T47D breast cancer cells and obtained an IC50 value of 3.31 µg/mL.

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