A new isocoumarin derivative from endophytic fungus <i>Pezicula neosporulosa</i> VDB39 from <i>Vaccinium dunalianum</i>

Four isocoumarin derivatives (<b>1–4</b>) and five phenols (<b>5–9</b>) were obtained from the endophytic fungus <i>Pezicula neosporulosa</i> VDB39, which was isolated from the branches of <i>Vaccinium dunalianum</i> Wight (Ericaceae). Compound <b>1</b> is a new derivative of isocoumarin. The structures were elucidated by spectroscopic methods. Single X-ray crystallography confirmed the absolute configuration of compound <b>1</b>. Additionally, the antiphytopathogenic fungi activity of isocoumarin derivatives (<b>1–4</b>) was evaluated.