conference paper drug structure 6 steroid unclassified drug 6 11alpha hydroxyprogesterone 4 3alpha hydroxy 5alpha pregnan 20 one derivative 4 cyclopropylketone derivative 4 dehydropregnenolone acetate 4 drug synthesis 4 ketone derivative 4 mercury derivative 4 neurosteroid derivative 4 pregnenolone derivative 4 reaction analysis 4 11,19 oxidoprogesterone 2 11,19-Oxidoprogesterone 2 11beta hydroxyprogesterone 2 5alpha pregnane 3,20 dione 2 5beta dihydroprogesterone 2 6,19 oxidoprogesterone 2 Active Transport, Cell Nucleus 2 Aldosterone 2 Animals 2 Cell Nucleus 2 Cytoplasm 2 Dynein 2 Gene Expression Regulation 2 Humans 2 Immunophilins 2 Natriuresis 2