clofarabine [ 2-chloro-2'-arabino-fluoro-2'-deoxyadenosine,2-chloro-2'-fluoroarabino-2'-deoxyadenosine,2-chloro-9-(2-deoxy-2-fluoro-beta-D-arbinofuranosyl)adenine,2-chloro-9-(2-deoxy-2-fluoroarabinofuranosyl)adenine,Cl-F-ara-A,Clofarex,Clolar,Evoltra,Genzyme brand of clofarabine ] structure given in first source; approved in the United States for treatment of acute lymphoblastic leukaemia in paediatric patients who have relapsed