Schincalide A, a Schinortriterpenoid with a Tricyclo[5.2.1.0^1,6]decane-Bridged System from the Stems and Leaves of Schisandra incarnate

Schincalide A (1), an unprecedented schinortriterpenoid possessing a tricyclo­[5.2.1.0^1,6]­decane-bridged system, was isolated from the stems and leaves of Schisandra incarnate. The structure with absolute configuration of 1 was determined by extensive spectroscopic analyses and single-crystal X-ray diffraction. A hypothetical biosynthetic pathway of 1 was postulated.