The Glucosides from Swertia mussotii Franch Optimum extracting process for Swertia mussotii by central composite design/response surface method Purification technology of iridoid glycosides and xanthones from Swertia mussotii by macroporous resin Determination Dynamic Accumulation of Six Species Medicinal Bioactive Components of Swertia mussotii Franch. in Different Growth Period Chemical constituents from Swertia mussotii