This comparison is very important given the significant twinning of the crystal that is not rigorously captured during the integration of the SCXRD frames. Quantitative comparison of the two structures 64 reveals a very low measure of similarity, δ = 0.016, with a low arithmetic mean of the differences between atom positions, d av = 0.0355 Å. The maximum shifts in atom positions are 0.4916 Å (I(3)), 0.2823 Å (I( )), and 0.2560 (I( )). All others are lower than 0.1 Å (see Table ). As such, we can reliably analyze the structure determined by SCXRD despite the severe challenges associated with twinning.