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A new cyclopentenone derivative, 4-hydroxyhypocrenone A, and a new naturally-occurring wickerol derivative, 8-acetoxywickerol A, as well as two known compounds, hypocrenone A and wickerol B, were purified from  Trichoderma atroviride  A-YMD-9-4, an endophytic fungus isolated from the marine red alga  Gracilaria verrucosa . The structures and relative configurations of two new isolates were established by a combination of 1 D/2D NMR, IR, and mass spectroscopic methods, and the absolute configuration of  1  was assigned on the basis of ECD data analyzed by quantum chemical calculations. Compounds  1  and  2  exhibited weak inhibition of one or two marine phytoplankton species.

Cyclopentenone and wickerol derivatives from the marine algicolous fungus Trichoderma atroviride A-YMD-9-4