abstract |
The present invention discloses 18-methyl-15β,16β-methylene-19-nor-20-spiro-4-en-3-one of the general formula (1) for treating excessive menstrual blood (generally, uterine bleeding) Intrauterine use, wherein R6 and R7 are hydrogen or methylene, and an intrauterine system comprising a compound of formula 1 for this purpose. |