dydrogesterone

noun

dy·​dro·​ges·​ter·​one ˌdī-drō-ˈjes-tə-ˌrōn 

: a synthetic progestational agent C₂₁H₂₈O₂ used in the diagnosis and treatment of amenorrhea, dysmenorrhea, endometriosis, and in a test for pregnancy

called also isopregnenone