Ethyl 6-fluorohexanoate , its cas register number is 589-79-7. It also can be called 2'-Fluoroethyl 6-fluorohexanoate ; 4-02-00-00932 (Beilstein Handbook Reference) ; BRN 1756049 ; Ethyl 5-fluoropentanecarboxylate ; Ethyl omega-fluorohexanoate .