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Jean Raimbault
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Such a group has been found by N. Dunfield, see the appendix to this preprint. The group is the fundamental group of a compact hyperbolic three--manifold which has injectivity radius large enough so that it is known to have unique products (and a little more) by a result of Delzant--Bowditch, but Nathan checked "by hand" that it is not left-orderable (by the same method as in his Inventiones paper with D. Calegari, which you should check out if you want more examples of non-left/right-orderable groups).

Jean Raimbault
  • 3.4k
  • 16
  • 27