A new 5,6-dihydro-2-pyrone derivative from Phomopsis amygdali, an endophytic fungus isolated from hazelnut (Corylus avellana)

- Endophytic fungi of Corylus avellana L. (hazelnut).
- Two fungi, namely Phomopsis amygdali and Fusarium oxysporium, were identified.
- P. amygdali provided a new secondary metabolite.
- 5,6-Dihydro-2H-pyran-2-one derivative was encountered for the first time in Phomopsis genus.