Quinaldopeptin is a symmetrical, cyclic decapeptide from an Amycolatopsis sp. that is a bis-intercalator of DNA, exhibiting strong in vitro antimicrobial and cytotoxic activity. Quinaldopeptin significantly prolongs the survival time of mice inoculated with a murine tumor, and also shows weak nematocidal activity. Quinaldopeptin is related to the luzopeptins and sandramycin.