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. 2020 Aug 3;9(8):983. doi: 10.3390/plants9080983

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© 2020 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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Chemical structures of indole alkaloids isolated from A. spruceanum and represented in 3D. (A) aspidocarpine (APC) [23,24]; (B) aspidoalbine (APA); (C) tubotaiwine (TBT) in reference pH. The heteroatoms are nitrogen (blue), oxygen (red) and hydrogen (white).