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Caffeine-glutaric acid (CAF-GLA) co-crystal of polytype I [5]. The kind of polytype of the nanoparticle is univocally determined by comparing the structure of type I, viewed along the [−2, 0, 1] zone axis in (a), with the experimental diffractogram (b) and the HRTEM image (c). The arrow points the region from which the diffractogram was extracted (reprinted by courtesy from Hasa et al. [5]).
