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. Author manuscript; available in PMC: 2014 Sep 9.
Published in final edited form as: Tetrahedron. 2013 Sep 9;69(36):7719–7731. doi: 10.1016/j.tet.2013.04.127

Fig. 3.

Fig. 3

X-ray structure of 44 (CCDC 935121). Due to static disorder in the ethyl ester group, the five ethyl hydrogen positions are uncertain and are therefore not shown.