Wiktionary
bufotalin
n. (context organic compound English) A cardiotoxic bufanolide steroid secreted by the (vern: common European toad) (''Bufo bufo'') and other related toads such as (taxlink Bufo melanostictus species noshow=1).
Wikipedia
Bufotalin
Bufotalin is a cardiotoxic bufanolide steroid, cardiac glycoside analogue, secreted by a number of toad species. Bufotalin can be extracted from the skin parotoid glands of several types of toad.