CAS 99-51-4 appears in our catalog under these names: 4-Nitro-o-xylene/ 99%, 4-Nitro-o-xylene, 99% , 1,2-DIMETHYL-4-NITROBENZENE, 99%, 1,2-Dimethyl-4-nitrobenzene, 3,4-Dimethylnitrobenzene, >98.0%(GC). Offered by: Chemat, Thermo Scientific (Alfa Aesar), Sigma-Aldrich, HPC Standards, TCI. Available pack sizes: 100g, 500g, 1x1000mg, 25g.