The invention describes 14,17-C.sub.2 -bridged steroids of general formula (I), ##STR1## wherein the various R groups are as defined in the specification, and wherein said steroids are, in contrast with the disclaimed compound 14,17-ethano-19-norpregn-4-ene-3,20-dione bioavailable even after peroral administration with high gestagenic action and are suitable for the production of pharmaceutical agents.
该发明描述了一种通式为(I)的14,17-C.sub.2-桥接类
固醇,其中各种R基如规范中所定义,且与被否定的化合物14,17-
乙烯基-19-去甲孕-4-烯-3,20-二酮相比,这些类
固醇在口服后具有高孕激素作用且具有
生物利用度,适用于制药剂的生产。