use of intrauterine 18 methyl - beta, beta methylene - 19 20 - spirox. - 4 - 3 - ones, intrauterine system containing 6 - methyl - 3 beta, beta methylene - 19 20 - spirox. - 4 - three ones, and use of such compounds for contraception and treatment of gynaecological

摘要

the invention relates to the use of intra uterine beta - methyl - 15 16 - 19 nor beta methylene - spirox - 4 - 3 - example of the general formula (1) for contraception and treatment of gynaecology. the invention also relates to an intrauterine system containing the compounds of formula (1).