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. Author manuscript; available in PMC: 2011 Aug 11.
Published in final edited form as: Tetrahedron Lett. 2010 Aug 11;51(32):4233–4236. doi: 10.1016/j.tetlet.2010.06.036

Figure 4.

Figure 4

ESI-MS (positive ion mode) spectrum of the sulfate complex. The solution was prepared from the sulfate salt of L (1.0×10-5 M) in MeOH/H2O (50:50).