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. 2015 Aug 16;22:19658–19666. doi: 10.1007/s11356-015-5146-7

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© The Author(s) 2015

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 3 — GC-MS chromatogram showing the carbazole derivatives with the retention times (R _t) 11.2 min (metabolite 1), 11.49 min (metabolite 2), and 11.54 min (metabolite 3) formed by IM 1785/21Gp strain after 120 h incubation (a) and standard of 2-hydroksycarbazole (b)