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Two new diterpenoids, penicichrysogene A ( 1 ) and penicichrysogene B ( 2 ), were isolated from the solid substrate fermentation cultures of  Penicillium chrysogenum  MT-12, an endophytic fungus isolated from the medicinal plant of  Huperzia serrata . Their structures were elucidated on the basis of extensive spectroscopic and spectrometric data (1D and 2D NMR, UV, IR, and HRESIMS). The absolute configurations of  1  and  2  were assigned on the basis of experimental and calculated electronic circular dichroism spectra. Compound  1  exhibited inhibitory activity on ATP release of thrombin-activated platelets with IC 50  = 42.7 ± 3.5 μM.

Two new diterpenoids from Penicillium chrysogenum MT-12, an endophytic fungus isolated from Huperzia serrata