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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 (https://creativecommons.org/licenses/by/4.0/).
Structures of glycosides 137–141, gallic acid (142), and its methyl ether derivative (143). Helianthamide and magnificamide are reported with disulfide connectivity, which is highlighted by the same color of bonding partners.