A triclinic polymorph of miconazole.

The crystal structure of the new triclinic polymorph of miconazole {MIC; C 18 H 14 Cl 4 N 2 O; systematic name: ( RS )-1-[2-(2,4-di-chloro-benz-yloxy)-2-(2,4-di-chloro-phen-yl)eth-yl]-1 H -imidazole} is reported and compared with the monoclinic form of solvent-free miconazole previously reported [Kaspiaruk & Chęcińska (2022 ▸). Acta Cryst. C 78 , 343-350]. A comparison shows a different orientation of imidazole and one di-chloro-phenyl ring between polymorphic mol-ecules. In the crystal structure of the title compound, only weak halogen bonds and C-H⋯π(arene) inter-actions are found. Hirshfeld surface analysis and energy framework calculations complement the comparison of the two polymorphic forms of the miconazole drug.