The work describes the isolation of some tetranortriterpenoids from
meliaceae family along with their characterization using NMR, Single
crystal X-ray Diffraction studies etc. Chemical modifications of some
selected molecules have been reported and the antifeedant activity of
all molecules have been assayed against spodoptura litura.Finally, some
insilico studies were carried out, which pointed to some molecular
parameters (descriptors) that might be responsible for the antifeedant
activity of these molecules