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

Fig. 4.

Fig. 4

Mass spectrum of the carbazole derivatives with the retention times (R t) 11.54 min (metabolite 3) formed by IM 1785/21Gp strain after 120 h incubation (a) and standard of 2-hydroksycarbazole (b)