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. 2021 Jan 18;19(1):41. doi: 10.3390/md19010041

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© 2021 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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Structure elucidation of topsentinol L trisulfate, isolated from the marine sponge Topsentia sp. (PNG07-3-073), by two-dimensional (2D) nuclear magnetic resonance (NMR). Chemical structures of (A) halistanol sulfate and (B) topsentinol L trisulfate. The chemical structure of TLT was deciphered from (C) homonuclear correlation spectroscopy (COSY) correlations between protons of immediately adjacent carbon atoms (shown in bold); (D) Heteronuclear multiple bond correlation (HMBC) spectroscopy (unidirectional arrows represent correlations between methyl or alkene protons and carbon atoms 3 bonds away); (E) Through-space proton-proton rotating frame Overhause effect spectroscopy (ROESY) correlations (bidirectional arrows) that reveal the configurations of key stereocenters.