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The authors identified 3,5- Dichlorobenzoic acid as an intermediate. It is very strange that the authors did not detect chlorocatechol, which is the major metabolite of DCBA.
As an example of major methabolits  see  Hartmann et al. (Hartmann, J., Reineke, W., & Knackmuss, H. J. (1979). Metabolism of 3-chloro-, 4-chloro-, and 3, 5-dichlorobenzoate by a pseudomonad. Applied and environmental microbiology, 37(3), 421-428).
To prove that the isolated strain utilized propyzamine as the sole carbon source the dynamic of accumulation and disappearance of intermediates during the bacterial growth as well as accumulation in chloride ions had to be done.  The later  would be a solid prove for the total degradation of aromatic part of propyzamide.

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