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. 2012 Dec 27;18(1):276–286. doi: 10.3390/molecules18010276

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© 2013 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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Upper part: (¹³C, ¹H)- and (¹⁵N, ¹H) couplings nJ (n = 2–4) according to the crosspeaks observed in the HMBC measurements of 9d. Lower part: Assignment of all ¹H, ¹³C and ¹⁵N signals of 9d. The δ values obtained in CD₃SOCD₃ at room temperature are related to TMS and NH₃ (liquid). The measurements were performed at 14.1 T (600 MHz for ¹H).