convallatoxin

noun

con·​val·​la·​tox·​in ˌkän-ˌval-ə-ˈtäk-sən, -vəl- 

: a glycoside C₂₉H₄₂O₁₀ obtained especially from the dried rhizome, roots, and flowers of the lily of the valley that acts on the heart and that on hydrolysis yields strophanthidin and rhamnose