(R)-(+)-8-fluoro-3-{[3-(5-fluoro-1H-indol-3-yl)propyl]amino}chromane-5-carboxamide

8-fluoro-3-{[4-(5-fluoro-1H-indol-3-yl)butyl]amino}chroman-5-carboxamide

8-fluoro-3-[[2-(5-fluoro-1H-indol-3-yl)ethyl](propyl)amino]chromane-5-carboxamide

3-{ethyl[3-(5-fluoro-1H-indol-3-yl)propyl]amino}-8-fluoro-3,4-dihydro-2H-chromene-5-carboxamide

3-{ethyl[4-(5-fluoro-1H-indol-3-yl)butyl]amino}-8-fluorochromane-5-carboxamide