The need for HT methods is clear: only 6/280 (~2%) of the experimental conditions trialed gave a crystalline form with a PXRD pattern that was similar to that of the predicted structure, 1. The vast majority of crystallization conditions led to either direct crystallization to the known α-polymorph or produced an unstable, transient phase that transformed into the α-polymorph upon loading onto the PXRD plate. This is perhaps not surprising: TMA has been studied intensively since at least 1969, and if 1 was straightforward to access, then it would have presumably been reported before.