1,4-dimethyl-2,3-dinitrobenzene 2,5-dimethyl-1,3-dinitrobenzene
This is the structure of a cocrystal of two different nitrated derivatives of p-xylene, submitted as a CSD deposition. See Dean H. Johnston, Heather M. Crather, CCDC 1905873: Experimental Crystal Structure Determination, 2019, DOI: 10.5517/ccdc.csd.cc21z6s1.