The lattice constants and bulk moduli were only indirectly included in the force field training via the volume-energy data points. In particular, the lattice constants deviate from the DFT values by at most 0.02 Å for the rocksalt, wurtzite, zincblende, and hcp structures. The bulk modulus for the energetically favored rocksalt structure is best described with less than 2 % error, while the other structures (wurtzite, zincblende, hcp) deviate around 5 % to 12 %. The caesium chloride structure, which is energetically unfavorable at ambient conditions, shows the largest deviation from the DFT reference data but constitutes the only experimentally confirmed structure, along with the rocksalt phase. However, the transition occurs at an extremely high pressure of 0.36 TPa.