名称:
Approaches to the synthesis of ring C transposed progesterone analogs: rac-7.beta.,15.alpha.-ethano-11,12-seco-11,19-bisnor-17.alpha.-pregn-4-ene-3,20-dione and rac-4,4-dimethyl-7,7-(ethylenedioxy)-4a.alpha.,4b.beta.,8a.alpha.,10a.beta.-perhydro-3-phenanthrenone