[4-(5-chloro-4-piperazin-1-ylpyrido[3,4-d]pyrimidin-2-yl)pyridin-2-yl]phenylamine
4-[5-chloro-2-(2-phenylaminopyridin-4-yl)pyrido[3,4-d]pyrimidin-4-yl]piperazine-1-carboxylic acid tert-butyl ester
[4-(5-cyclopropyl-4-piperazin-1-ylpyrido[3,4-d]pyrimidin-2-yl)pyridin-2-yl]-(2-fluorophenyl)amine
4-{5-chloro-2-[2-(2-fluorophenylamino)pyridin-4-yl]pyrido[3,4-d]pyrimidin-4-yl}piperazine-1-carboxylic acid tert-butyl ester
4-{5-cyclopropyl-2-[2-(2-fluorophenylamino)pyridin-4-yl]pyrido[3,4-d]pyrimidin-4-yl}piperazine-1-carboxylic acid tert-butyl ester