"(9?,10?)-Pregna-4,6-diene-3,20-dione-d9; 6-Dehydro-9?,10?-progesterone-d9; 6-Dehydroretroprogesterone-d9; 6?-Dehydro-retro-4-pregnene-3,20-dione-d9; Diphaston-d9; Dufaston-d9; Gynorest-d9; Hydrogesterone-d9; Prodel-d9; Retrone-d9;",Dydrogesterone Stable Isotopes