1. The new pentacyclic saponine ecdysantherin [3β-hydroxy-20-methylpregn-5,14-dien-16-one-(18-20)-lactone] from Ecdysanthera rosea Hook. et Arn. (Apocynaceae) of Vietnam;Luger;Acta Cryst,1996
2. Determination of the chemical structure of ecdysantherin;Chu;Tap Chi Duoc Hoc,1997
3. The crystal structure of 3β, 14β,20-trihydroxypregnen-5-oic-18(18→20)lactone derived from a Vietnamese folk medical plant;Luger;Cryst Res Technol,1998
4. Nuclear magnetic resonance spectrogram of 3, 14, 20-trihydroxypregn-5-ene-18-oic-(18-20)-lactone, a chemical component first isolated from Ecdysanthera rosea Hook et Arn, Apocynaceae;Pham;Tap Chi Duoc Hoc,1997