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. Author manuscript; available in PMC: 2008 Nov 15.
Published in final edited form as: Bioorg Med Chem. 2007 Aug 22;15(22):7042–7047. doi: 10.1016/j.bmc.2007.07.041

Figure 1.

Figure 1

Chemical structures of 3-[(trimethylammonio)methyl]catechol (1), 4-hydroxy-3-[(trimethylammonio)methyl]catechol (2), 5-hydroxy-3-[(trimethylammonio)methyl]catechol (3), N,N-dimethylepinephrine (4), 6-hydroxy-N,N-dimethylepinephrine (5), N,N′-(2,3-dihydroxybenzyl)-N,N,N′,N′-tetramethyl-1,6-hexanediamine dibromide (DTH, 6), N,N′-(2,3-dihydroxybenzyl)-N,N,N′,N′-tetramethyl-1,10-decanediamine dibromide (DTD, 7), hemicholinium-15 (HC-15, 8) and hemicholinium-3 (HC-3, 9).