Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs43094-021-00245-z/MediaObjects/43094_2021_245_Fig2_HTML.png)
Analysis of the sample taken from the de-addiction center group. a Mass spectrum of the sample from the de-addiction center group. b Fragmentation pathway observed in the sample from the de-addiction center group. The key ions detected in this spectrum were of 6-acetylemorphine and morphine forming a peak at (m/z) 331 and 286, respectively