abstract |
An optically active compound having a 13 Beta -carbonsubstituted-17-hydroxy-8,14-secogona-1,3,5(10),9(11),15-pentaen14-one nucleus is produced from a compound having a 13 Beta carbon-substituted-8,14-secogona-1,3,5(10),9(11),15-pentaene14,17-dione nucleus by the action on the latter of the redoxenzyme system obtained by culturing a Candida, Debaryomyces, Kloeckera, Pichia, Rhodotorula, Schizosaccharomyces or Hansenula micro-organism. |