4-hydroxy-2-butenoic acid lactones

4-hydroxy-3-keto-.delta.4-steroids

4-imino-19-nor-a-homo-steroid-trienes and process for their...

4-lower alkyl-4-pregnene-3,20-diones

4-oxa and 4-thia steroids

4-oxa steroides et procede de preparation

4-oxa-5-hydroxymethyl-steroids and process for their...

4-oxa-9.beta.,10.alpha.-steroids

4-oxa-androstanes and process for the manufacture thereof

4-oxo-19-nor-a-homo-steroid dienes and a process for their...

4-pregnene-3,20-dione-11.beta.,17.alpha.,21-triol-21-carbeth...

4-pregnene-derivatives, a process for their preparation,...

4-spiro (cyclopropyl)androstenes

4-substituted 17.beta....

4-substituted androstendione derivatives and process for...

4-substituted-b-norsteroids

4-substituted...

4.alpha.,7.alpha.-carbonyl-5-cyano-17-hydroxy-3-oxo-5.beta.,...