Wiktionary
astilbin
n. (context organic compound English) A flavanonol found in ''Astilbe'' and other plants, used as an insecticide.
Wikipedia
Astilbin
Astilbin is a flavanonol, a type of flavonoid. Astilbin is the (2R-trans)-isomer; neoisoastilbin is the (2S-cis)-isomer and isoastilbin is the (2R-cis)-isomer.