p. 1127 - 1134
(2007/10/02)3β-tertiobutyldimethylsilyloxy-18-cyano-20,20-ethylenedioxy-pregn-5-ene
3β-tertiobutyldimethylsilyloxy-18-vinyl-20,20-ethylenedioxy-pregn-5-ene
3β-acetoxy-18-cyano-20,20-ethylenedioxy-pregn-5-ene
3β-hydroxy-18-cyano-20,20-ethylenedioxy-pregn-5-ene
3β-hydroxy-18-vinyl-20,20-ethylenedioxy-pregn-5-ene