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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/).
The key HMBC and NOESY correlations for compound 10, compound 13 and 14 chemical structures, and projection for 1La (a) projection in the direction of the arrow, the wedge indicates the plane of the A-ring); and 1Lb (b) transition for 13.