3d image of cucurbitacin skeletal formula

cucurbitacin cucurbita-5-ene pumpkin gourd cucurbitaceae herbivores triterpene monoterpenoid terpenoid monoterpene terpene triterpene hydrocarbon glycoside brassicaceae scrophulariaceae begoniaceae elaeocarpaceae datiscaceae desfontainiaceae polemoniaceae primulaceae rubiaceae sterculiaceae rosaceae thymelaeaceae mushrooms russula hebeloma cucumbers zucchinis cytotoxic bitter 3d cycle alkaloid formula flavone mechanism structural molecule dietary phytoestrogen bioactive skeletal geometry prescription drug intermediate