Studies on Chemical Constituents of the Root of Pimpinella thellungiana Wolff. Chemical Constituents of the Root of Pimpinella thellungiana Isolation and Identification of Thellungianin C and D from the Root of Thellung Pimpinella (Pimpinella thellungiana) Separation and Identification of Thellungianin H from Thellung Pimpinella (Pimpinella thellungiana) Root Separation and Identification of Thellungianin G from the Root of Pimpinella thellungiana Wolff.