Described herein are crystalline forms of (R)-3-(2-(trans-4-(2-aminoethylamino)cyclohexyl)acetamido)-2-hydroxy-3,4-dihydro-2H-benzo[e][1,2]oxaborinine-8-carboxylic acid. In some embodiments, the crystalline forms are formulated for treating a subject in need thereof with a bacterial infection.
