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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Drug Alcohol Depend. 2013 Sep 2;133(2):693–703. doi: 10.1016/j.drugalcdep.2013.08.021

Figure 1. Chemical structures of dopamine and l-isocorypalmine (l-ICP) and l-tetrahydropalmatine (l-THP).

Figure 1

Note that part of the l-ICP structure resembles dopamine (DA) structure.