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. Author manuscript; available in PMC: 2008 Feb 6.
Published in final edited form as: Biochem Biophys Res Commun. 2006 Jan 30;341(4):904–910. doi: 10.1016/j.bbrc.2006.01.093

Fig. 5.

Fig. 5

Chemical structures of agonists and antagonists of M2 receptors. NMS and atropine have similar structures. As shown carbachol is an analog of acetylcholine.