Intrauterine use of 18-methyl-15β,16β-methylene-19-nor-20-spiro-4-en-3-one, including 18-methyl-15β, 16β-methylene-19- Intrauterine system of -20-spiro-4-en-3-one, and its use in contraception and gynecological treatment
The invention describes 18-methyl-15-, 16--methylene-19-nor-20-spiro-4-en-3-one of the general formula (1) for contraception and obstetrics and gynecology treatment Use □, and an intrauterine system comprising a compound of formula 1.