A new tremulane sesquiterpene, lactedine (1), along with seven known tremulane sesquiterpenes (2-8) and one known triterpene (9) were isolated from the fungus Irpex lacteus. Their structures were established on the basis of extensive spectroscopic data and DP4+ probability analyses.
Keywords: DP4+; Irpex lacteus; Radix; lactedine; tremulane sesquiterpene.