Molecular Conformation article drug synthesis stereochemistry unclassified drug 3alpha hydroxy 5alpha pregnan 20 one 2 3alpha hydroxy a homo 5 pregnen 20 one 2 3beta hydroxy a homo 5 pregnen 20 one 2 3beta hydroxy a homo 5alpha h pregnan 20 one 2 4 (2' (1h benzo[b]azol 3 yl)ethyl) 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 2 4 (2' (1h benzo[b]azol 3 yl)ethyl) 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 2 4 (2' phenylethyl) 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 2 4 (2' phenylethyl) 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 2 4 (3' azidopropyl) 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 2 4 (3' azidopropyl) 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5beta cholestan 3 one 2 4 aminobutyric acid A receptor 2 4 benzyl 5 n (diethoxyphosphorylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 2 4 benzyl 5 n (diethoxyphosphorylmethylen)carboxamido 4 aza 5beta cholestan 3 one 2 4 benzyl 5 n (methoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 2 4 benzyl 5 n (methoxycarbonylmethylen)carboxamido 4 aza 5beta cholestan 3 one 2 4 benzyl 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 2 4 benzyl 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 2 4 butyl 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 2 4 butyl 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 2 4 propargyl 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 2 4 propargyl 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5beta cholestan 3 one 2 4-Azacholestanes 2 4alpha hydroxy a homo 5 pregnen 20 one 2 A-homopregnane 2 Animals 2