A series of 23 racemic mefloquine–oxazolidine derivatives, 4-[3-(aryl)hexahydro[1,3]oxazolo[3,4-a]pyridin- 1-yl]-2,8-bis(trifluoromethyl)quinolines, derived from (R*, S*)-(±)-mefloquine and arenealdehydes, have been evaluated for their activity against four cancer cell lines (HCT-8, OVCAR-8, HL-60, and SF-295). Good cytotoxicities have been determined with IC50 values ranging from 0.59 to 4.79 lg/mL. In general...