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. 2018 Jan 19;23(1):214. doi: 10.3390/molecules23010214

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© 2018 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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Structural characterization of fraction 1. (a) ESI-MS spectra of fraction 1; (b) ¹H-NMR spectra of fraction 1; (c) ¹³C-NMR spectra of fraction 1; (d) Structure of fraction 1 was identified as cyclo(l-Pro-d-Ile).