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A new bergamotane sesquiterpenoid, named xylariterpenoid H (<b>1</b>), along with fourteen known compounds (<b>2</b>–<b>15</b>), were isolated from the crude extract of <i>Aspergillus fumigatus</i>, an endophytic fungus isolated from <i>Delphinium grandiflorum</i> L. Their structures were elucidated mainly by extensive analyses of NMR and MS spectroscopic data. In addition, the screening results of antibacterial and cytotoxic activities of compounds <b>1</b>–<b>15</b> showed that compound <b>4</b> displayed antibacterial activities against <i>Staphylococcus aureus</i> and MRSA (methicillin-resistant <i>S. aureus</i>) with an MIC value of 3.12 µg/mL.