3-phenylspiro[1,3-thiazolidine-2,3'-1H-indole]-2',4-dione

5'-amino-4'-hydroxyspiro[1H-indole-3,2'-furan]-2,3'-dione

1-dodecylindole

3-propyl-1,3-dihydroindol-2-one

3-hydroxy-3-(nitromethyl)-1H-indol-2-one