<jats:p> New bisindolylbenzenoids designated petromurins A (1), B (2), C (3), and D (4) were isolated from the ascostromata of Petromycesmuricatus. These structures were determined by chemical and spectroscopic methods. Keywords: Petromycesmuricatus; bisindolylbenzenoids; petromurin A, B, C, and D; ascostromata; Aspergillusmuricatus.