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. 2014 Apr 22;12(4):2326–2340. doi: 10.3390/md12042326

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© 2014 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 license (http://creativecommons.org/licenses/by/3.0/).

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(a) ¹H-¹H coupling constants of the dihydroxy γ-lactam ring observed in 3. ¹H-¹H coupling constants of (b1) the dihydroxy γ-lactam ring possessing 1S*, 2R*, and 3R*, and (b2) 1S*, 2S*, and 3R* found in literature.