Structure and absolute configuration of citreohybridones isolated from Penicillium species

Four new meroterpenoids have been isolated from the mycelium of the hybrid strain KO 0031 derived from Penicillium citreo-viride B. IFO 6200 and 4692. Their stereostructures have been elucidated on the basis of their spectral data and some chemical evidence, and their absolute configurations have also been elucidated by the modified Mosherʹs methods.