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. Author manuscript; available in PMC: 2007 Nov 21.
Published in final edited form as: Tetrahedron Asymmetry. 2007 Jul 4;18(12):1391–1397. doi: 10.1016/j.tetasy.2007.06.012

Figure 4.

Figure 4

1H NMR spectra for the protons at C2, C5 and methyl group of compound 21. (A) 1H NMR signal for the proton at C2 in the absence of FBTrp. (B) 1H NMR resonance for the proton at C2 in the presence of FBTrp. (C) 1H NMR signal for the protons at C5 and the methyl group of 21 in the absence of FBTrp. (D) Same as in Figure C but in the presence of FBTrp.