In the bulk scale of crystallization, urea-succinic acid (U-SA) cocrystals have been reported to only form stable 2:1 U-SA cocrystal, without any metastable 1:1 by slow evaporation and cooling crystallization in an aqueous solvent. this work, were applied nano-crystallizers, i.e. nano-pores controlled pore glass (CPG). It is first time demonstrate that, with confined solution, it possible produ...