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. 2014 Dec 20;14:513. doi: 10.1186/1472-6882-14-513

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© Lee et al.; licensee BioMed Central. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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The HPLC analysis of the standard material to ST. Phytochemical analysis was performed by HPLC as described in the Methods section. Tuberostemonine N was utilized as an authentic standard (arrows) and found that the concentration of tuberostemonine N in ST was calculated to be 0.3 mg/g (yield 0.03%). a) HPLC-ELSD analytical data of tuberostemonine N, b) HPLC-ELSD analytical data of ST.