A novel polymorph of 10,11-dihydrocarbamazepine (form IV), which had been predicted to be thermodynamically feasible, was obtained from the vapour phase and displays an R22(8) hydrogen bonded dimer motif in contrast to the catemeric motifs in forms I–III.
Arlin, J-B., Johnston, A., Miller, G. J., Kennedy, A., Price, S. L., & Florence, A. (2010). A predicted dimer-based polymorph of 10,11-dihydrocarbamazepine (Form IV). CrystEngComm, 12(1), 64-66. https://doi.org/10.1039/b914365c