title: Cardiotoxic principle in comfrey.
mesh_terms: D000481:Allantoin / Q000494:pharmacology*; D000818:Animals; D001001:Anura; D003864:Depression, Chemical; D006339:Heart Rate / Q000187:drug effects*; D066298:In Vitro Techniques; D009200:Myocardial Contraction / Q000187:drug effects*; D010946:Plants, Medicinal
chemical_list: D000481:Allantoin