摘要:
6,6-ethylene-15,16-methylene-3-oxo-17.alpha.-pregn-4-ene-21,17.alpha.-carbolactones of general Formula I ##STR1## wherein ##STR2## is a CC-single of CC-double bond, R.sub.1 is a hydrogen atom or a methyl group,R.sub.2 is a methyl or ethyl group, and ##STR3## exhibit strong gestagen potency and an aldosterone-antagonistic activity.