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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.