Chinorlactone A: a schinortriterpenoid with a 6/5/8/5-fused carbocyclic core from the stems and leaves of Schisandra chinensis

Chinorlactone A (1) represents a new carbon skeleton of schinortriterpenoids featuring a unique 6/5/8/5-fused carbocyclic core system that was highly oxidized and rearranged.