11-methyl-5-methylsulfanyl-4,6-dihydro-3H-pyrido[4,3-b]carbazole

4-methyl-1,1-bismethylthio-2-oxo-1,2,3,4-tetrahydrocarbazole

4-(3-indolyl)-1-methylsulfinyl-1-methylthiopentan-2-one

tert-butyl 2-hydroxy-4-methyl-1,1-bismethylthio-1,2,3,4-tetrahydrocarbazole-2-acetate

ethyl ester of 3-(3-indolyl)butyric acid