sarmentogenin

noun

sar·​men·​to·​gen·​in sär-ˌmen-tə-ˈjen-ən  ˌsär-mən-ˈtäj-ə-nən 

: a crystalline steroid lactone C₂₃H₃₄O₅ closely related to digitoxigenin, found in several plants of the genus Strophanthus, obtained especially by hydrolysis of sarmentocymarin, and used in a synthesis of cortisone