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. Author manuscript; available in PMC: 2008 Nov 5.
Published in final edited form as: Tetrahedron. 2007 Nov 5;63(45):11030–11039. doi: 10.1016/j.tet.2007.08.041

Figure 2.

Figure 2

Nuclear Overhauser Effects (NOEs), indicated by curved arrows, seen in 1 in both CDCl3 and (CD3)2SO solvents. Similar NOEs are found in typical dipyrrinones, such as methyl xanthobilirubinate.