6(E)- and 6(Z)-(3-Ethoxycarbonylpropyl)- and -(3-carboxypropyl)oximes of 16alpha, 17alpha-cyclohexanopregn-4-ene-3,6,20-trione were synthesized. The reactions of these ester ligands with pentarane-binding proteins of the uterine cytosol and blood serum were studied; the latter exhibits a higher affinity. The preferred binding of the oxime (E)-isomer relative to the (Z)-isomer was noted.
6(E)- and 6(Z)-(3-Ethoxycarbonylpropyl)- and -(3-carboxypropyl)oximes of 16alpha, 17alpha-cyclohexanopregn-4-ene-3,6,20-trione were synthesized. The reactions of these ester ligands with pentarane-binding proteins of the uterine cytosol and blood serum were studied; the latter exhibits a higher affinity. The preferred binding of the oxime (E)-isomer relative to the (Z)-isomer was noted.