yohimbine molecule, structural chemical formula, ball-and-stick model, image a2-adrenergic receptor antagonist

yohimbine quebrachine a2adrenergic receptor antagonist indole alkaloid pausinystalia johimbe veterinary drug molecule molecular structure chemical formula isolated model c21h26n2o3 atom atomic blood chemistry herbal nutritional oxygen pressure recreational science carbon health hormone skeletal supplement dietary hydrogen stimulant aphrodisiac nitrogen food organic tree dysfunction erectile sedation laboratory