Carbamazepine forms a 1:1 solvate with trifluoroacetic acid (systematic name: 5 H -dibenzo[ b , f ]azepine-5-carboxamide trifluoroacetic acid solvate), C 15 H 12 N 2 O·C 2 HF 3 O 2 . The compound crystallizes with one molecule of carbamazepine and one of trifluoroacetic acid in the asymmetric unit to form an R 2 2 (8) motif. The solvent molecule is disordered over two sites, with site-occupancy factors 0.53 (1) and 0.47 (1).