A new triterpenoid compound (1) and a known compound (2) were isolated from the product of biotransformation of glycyrrhizic acid by Aspergillus niger. On the basis of the 1D and 2D NMR (1H-1H COSY, HSQC, HMBC and NOESY) and MS spectrometry, their structures were established as 7, 15α-dihydroxy-3,11-dioxo-oleana-12-en-30-oic acid (1) and 15α-hydroxy-3,11-dione-oleana-12-en-30-oic acid (2), respectively.
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Document Type: Research Article
Beijing Institute of Radiation Medicine, Beijing, China
Beijing Institute of Radiation Medicine, Beijing, China,Tianjin University of Traditional Chinese Medicine, Tianjin, China
May 1, 2008