Occurrence of the insecticidal 16,17-didehydro-16(E)-stemofoline in Stemona collinsae.

@article{Jiwajinda2001OccurrenceOT,
  title={Occurrence of the insecticidal 16,17-didehydro-16(E)-stemofoline in Stemona collinsae.},
  author={Suratwadee Jiwajinda and Nobuhiro Hirai and Kazuhiro Watanabe and Vilai Santisopasri and N Chuengsamarnyart and Koichi Koshimizu and Hajime Ohigashi},
  journal={Phytochemistry},
  year={2001},
  volume={56 7},
  pages={
          693-5
        }
}
The occurrence of two alkaloids, 16,17-didehydro-16(E)-stemofoline and its isomer at C-4, 16,17-didehydro-4(E)-16(E)-stemofoline, were found together with a known insecticidal compound, stemofoline, in Stemona collinsae. The 16,17-didehydro-16(E)-stemofoline displayed higher insecticidal and antifeedant activities against the diamondback moth larvae than stemofoline.