Stereumins K-P, sesquiterpenes from the fungus Stereum sp. CCTCC AF 2012007

► The chemical constituents of the fungus Stereum sp. YMF1.1504 were investigated. ► Sesquiterpenes stereumins K-P were obtained. ► The structures of stereumins K, L, M, and P were confirmed by single-crystal X-ray diffraction. ► The absolute configuration of stereumin K was determined.