1-(α-imino-2',4',6'-trimethylbenzyl)-2-hydroxy-2,3,3-trimethyl-indoline

9,9,9a-trimethyl-3-(4'-chlorophenyl)-1,2,4-oxadiazolo[4,5-a]indoline

9,9,9a-trimethyl-3-mesityl-1,2,4-oxadiazolo(4,5-a)indoline

N-(o-(1',1'-dimethyl-2'-oxo-propyl)-phenyl)-4-chlorobenzamidine