Two new peptaibols, asperelines G (1) and H (2), together with five known compounds, asperelines A (3), C (4), D (5), E (6), and F (7) were isolated from the marine-derived fungus Trichoderma asperellum. The structures of these compounds were determined through spectroscopic methods, X-ray diffraction analysis, and chemical derivatization. This study is the first report on asperelines with an acetylated C-terminus and a crystal structure.