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Studies on the Novel Diterpenoic Constituents of TU-JIN-PI IV. Isolation and Identification of Pseudolaric Acid D and Pseudolaric Acid E

Li Zhu-Lian;Chen Ke;Pan De-Ji;Xu Gnang-Yi School of Pharmacy, Shanghai Medical University, Shanghai Institute of Pharmaceutical Industrial Research, Shanghai  
Two new diterpenoic acids, 1 and 2, were isolated from Tu-Jin-Pi (the root bark of Pseudolarix kaempferi, Gord.). 1 was shown to be 18-hydroxy-ent-kaur-15-en-17- oic acid (pseudolaric acid D), and 2, ent-kaur-15-en-17, 18-dioic acid (pseudolaric acid E) by their IR, MS, ~1H NMR and ~(13)C NMR respectively.
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