<unk> s are drugs used in the treatment of congestive heart failure and<unk>  arrhythmia. These<unk> s are found as secondary metabolites in several plants, but also in some animals. Some of these compounds (ouabain and some frog poisons) are used in Africa as arrow-poisons for hunting.
Cardiac glycoside
Carotenoid
Short chain fatty acid
Insulin analog
Angiotensinamide
Indole alkaloid
Sympathomimetic amine
Ouabain