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Bipolarins A-H (1-8),eight new tetracyclic ophiobolin-type sesterterpenes featuring a rare oxaspiro[4.4]nonane moiety,were isolated from cultures of fungus Bipolaris sp.TJ403-B1.Their structures and absolute configurations were elucidated by comprehensive spectroscopic analyses,single-crystal X-ray diffraction experiments,electronic circular dichroism and 13C NMR calculations.Additionally,compound 5 exhibited significant selective antimicrobial activity against Enterococcusfaecalis with an MIC value 8 μg·mL-1.