article chemical reaction drug synthesis drug targeting 4 substitution reaction unclassified drug 1 hydroxy 10 methyl 9(10h) acridone 2 1,3 dihydroxy 5 methoxyacridone 2 10 allyl 6 chloro 4 methoxy 9(10h) acridone 2 10 allyl 6 chloro 9(10h) acridone 2 2 fluoro 5 methoxy n (pyridine 3 yl)acridone 4 carboxamide 2 3 allyloxy 7 methoxy 1 hydroxyacridone 2 3,7 dimethoxy 1 hydroxyacridone 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 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