Nine undescribed prenylxanthone derivatives, aspergixanthones L-T (1-9), were isolated from the fungus Aspergillus stellatus. Compound 4 represents the first propionylated prenylxanthone, while compounds 7-9 are the first examples of prenylxanthones adorned with a 2,3-butanediol group. Their structures with absolute configurations were elucidated based on comprehensive spectroscopic analyses, ECD calculation, single-crystal X-ray diffraction, Mo