11alpha hydroxyprogesterone 4 11beta hydroxysteroid dehydrogenase 2 3alpha hydroxy 5alpha pregnan 20 one derivative 2 Chinese hamster 2 animal cell 2 article 2 competitive inhibition 2 conference paper 2 cyclopropylketone derivative 2 dehydropregnenolone acetate 2 drug structure 2 drug synthesis 2 enzyme activity 2 enzyme inhibition 2 enzyme kinetics 2 genetic complementation 2 genetic transfection 2 glycosylation 2 ketone derivative 2 mercury derivative 2 neurosteroid derivative 2 nonhuman 2 potassium excretion 2 pregnenolone derivative 2 priority journal 2 reaction analysis 2 sodium retention 2 steroid 2 unclassified drug 2