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. Author manuscript; available in PMC: 2010 Aug 7.
Published in final edited form as: J Org Chem. 2009 Aug 7;74(15):5369–5380. doi: 10.1021/jo900856x

Figure 4.

Figure 4

1H-13C HMBC spectra (600 MHz) of 4b in DMSO- d6 showing the three methylene groups (a, b and c) of interest and their long range correlation with the two carbonyl carbons (I and II).