bufotoxin

noun

bu·​fo·​tox·​in -ˈtäk-sən 

: a toxic steroid C₄₀H₆₀N₄O₁₀ obtained from the skin glands of the common toad of Europe (Bufo vulgaris) that resembles digitalis in physiological activity and yields bufotalin on hydrolysis

also : any of several similar steroids from the secretions of other toads compare bufagin