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. Author manuscript; available in PMC: 2020 Oct 1.
Published in final edited form as: J Pain. 2019 Apr 18;20(10):1218–1235. doi: 10.1016/j.jpain.2019.04.005

Figure 1.

Figure 1.

Chemical structure and dominant pharmacology of each enantiomer of tramadol and the M1 metabolite. An enantiomer is each of a pair of molecules that are mirror images of each other.