sentences:  Many "Epichloë" endophytes produce a diverse range of natural product compounds with biological activities against a broad range of herbivores.The purpose of these compounds is as a toxicity or feeding deterrence against insect and mammalian herbivores.Ergoline alkaloids (which are ergot alkaloids, named after the ergot fungus, "Claviceps purpurea", a close relative of the epichloae) are characterized by a ring system derived from 4-prenyl tryptophan.