Nimonol was obtained from the fresh green whole leaves of Azadirachta
indica and its structure has been reassigned on the basis of COSY, NOE
SY and H-1 NMR spectral data. 6-Acetylnimonol was identified as 6-acet
oxyazadirone and dihydronimonol was shown to be identical to isomelden
in. The mp and H-1 NMR spectra of 6-acetylnimocinol were markedly diff
erent from those of 6-acetoxyazadirone showing that nimocinol and nimo
nol have different structures. (C) 1997 Elsevier Science Ltd.