(2R,7R)-2,7-dibromocycloheptanone InChI=1/C7H10Br2O/c8-5-3-1-2-4-6(9)7(5)10/h5-6H,1-4H2/t5-,6-/m1/s cycloheptanone, 2,7-dibromo-, (2R,7R)-