tert-butyl 5-methyl-7-phenyl-5H-pyrido[1,2-a:4,3-b']diindole-13-carboxylate

tert-butyl 5-methyl-7-propyl-5H-pyrido[1,2-a:4,3-b']diindole-13-carboxylate

2-{2-[1-(Decahydro-naphthalen-1-yl)-piperidin-4-ylamino]-phenyl}-malonic acid di-tert-butyl ester

2-(2-{1-[1-(9H-Fluoren-2-yl)-ethyl]-piperidin-4-ylamino}-phenyl)-malonic acid di-tert-butyl ester

2-[2-(1-Dicyclohexylmethyl-piperidin-4-ylamino)-phenyl]-malonic acid di-tert-butyl ester