Metabolic Consequences of Ingesting w-Fluorooleate The shrub Dichapetalum toxicarium, native to Sierra Leone, produces w-fluorooleate, which is highly toxic to warm-blooded animals. HH F-CH-(CH)-C-C-(CH)-COO wo-Fluorooleate This substance has been used as an arrow poison, and powdered fruit from the plant is sometimes used as a rat poison (hence the plant's common name, ratsbane). Why is this substance so toxic?