Notes: trans-2-Decenoic acid is an unsaturated fatty acid found in royal jelly produced from the hypopharyngeal and mandibular gland secretions of honeybees. It is isolated in conjunction with 10-HDA (Item No. 10976) and both demonstrate weak estrogenic activity, inhibiting binding of 17β-estradiol (Item No. ISO60155) to estrogen receptor β.{29007}