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. 2018 Apr 5;43(4):539–549. doi: 10.1016/j.jgr.2018.03.005

Fig. 7.

Fig. 7

The verified chemical structures of Compound 3 and Compound 4. The C-23 hydroxy group and the substituted tetrahydrofuran side chain were elucidated by selected HMBC and 1H-1H COSY correlations. COSY, correlation spectroscopy; HMBC, heteronuclear multiple-bond correlation.