article stereochemistry unclassified drug 19 acetoxystigmasta 4,22 dien 3,6 dione 1 19 nor 3,22,23 trihydroxystigmasta 1,3,5(10) triene 6 one 1 19 norstigmasta 1(10),5,22 trien 3b ol 1 19 norstigmasta 1,3,5(10) triene 3,22,23 triol 1 19 norstigmasta 1,3,5(10),22 tetraen 3 ol 1 3 hydroxystigmastane 1 3beta acetoxy 19 norstigmasta 1(10),5,22 triene 1 3beta acetoxy 5alpha bromo 6,19 epoxystigmast 22 ene 1 3beta acetoxy 5alpha bromostigmast 22 en 6beta ol 1 3beta acetoxy 5beta,6beta epoxystigmast 22 ene 1 3beta acetoxystigmasta 5,22 dien 19 ol 1 3beta,19 diacetoxystigmasta 5,22 diene 1 4 (2' (1h benzo[b]azol 3 yl)ethyl) 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 1 4 (2' (1h benzo[b]azol 3 yl)ethyl) 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 1 4 (2' phenylethyl) 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 1 4 (2' phenylethyl) 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 1 4 (3' azidopropyl) 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 1 4 (3' azidopropyl) 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5beta cholestan 3 one 1 4 benzyl 5 n (diethoxyphosphorylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 1 4 benzyl 5 n (diethoxyphosphorylmethylen)carboxamido 4 aza 5beta cholestan 3 one 1 4 benzyl 5 n (methoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 1 4 benzyl 5 n (methoxycarbonylmethylen)carboxamido 4 aza 5beta cholestan 3 one 1 4 benzyl 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 1 4 benzyl 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 1 4 butyl 5 n cyclohexylcarboxamido 4 aza 5alpha cholestan 3 one 1 4 butyl 5 n cyclohexylcarboxamido 4 aza 5beta cholestan 3 one 1 4 propargyl 5 n (ethoxycarbonylmethylen)carboxamido 4 aza 5alpha cholestan 3 one 1