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. 2019 Nov 12;24(22):4086. doi: 10.3390/molecules24224086

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Ultra-performance liquid chromatography (UPLC) chromatograms of indigo naturalis (IN) granules: peaks 1–3 are derived from indigo (6.79 min), indirubin (7.16 min), and column (11.58 min), respectively.