Alkaloids [Chemical/Ingredient] Ergot Alkaloids [Chemical/Ingredient] Ergot Alkaloids Clavine Alkaloids Ergots Alkaloids originally isolated from the ergot fungus Claviceps purpurea (Hypocreaceae). They include compounds that are structurally related to ergoline (ERGOLINES) and ergotamine (ERGOTAMINES). Many of the ergot alkaloids act as alpha-adrenergic antagonists. 4023 Ergot Alkaloids C25600 C0014707 M0007656 Ergot Alkaloids N0000007620 D004876