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The isolation and structure elucidation of gedunin 1, the antimalarial agent of Azadirachta indica, are reported. Its 1H- and 13C-nmr spectra were assigned by using one- and two-dimensional nmr spectroscopy, especially homonuclear and heteronuclear COSY, nOe difference, and COLOC experiments.
Khalid et al. (Fri,) studied this question.