A momordicine is any of several compounds found in the bitter melon vine, Momordica charantia.
They are glycosides of cucurbitane derivatives.
[1] They include Momordicine II and IV can be extracted from the leaves of M. charantia by methanol.
They have been found to deter egg-laying of the leaf mining fly (Liriomyza trifolii) at a combined concentration of 96 μg/cm2.
[1]