eight novel organic sulfur compounds featuring an unprecedented structure among natural organosulfur molecules are reported . The identified compounds, named dirchromones (1-8), were isolated from dichloromethane extract of the roots, bark, and wood of Dirca palustris, an endemic shrub of eastern North America.Theri identification was based on thoroogh NMR, IR, and HRMS spectroscopic data interpretation. These compounds showed cytotoxic and mild Gram-positive antibcterial activities in vitro, while being inactive against Gram-negative Escherichil coli and the yeast Candida albicans.this is the first report of sulfur-containing compounds from a species of the Thymelaeaceae