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2P. Liu, W. Qiao, W. Jia, J. Teng and H.-Q. Duan.
(17S)-2[alpha],3[alpha],18[beta],23,24-Pentahydroxy-19(18[rightwards arrow]17)-abeo-28-norolean-12-en-21-one from the rhizome of Phlomis umbrosa, Acta Cryst. (2006). E62, o919-o921Â Â Â Â