Bipolarsterol A, a steroid with an unprecedented 6/5/6/5 carbon skeleton from the phytopathogenic fungus Bipolaris oryzae

Bipolarsterols A−H ( 1 − 8 ), eight undescribed steroids were isolated from Bipolaris oryzae , along with nine known congeners. Their structures and absolute configurations were elucidated by comprehensive spectroscopic techniques, NMR and ECD...