3-Methyl-4-nitrobenzoic acid is a fine chemical product with high added value. Many important organic products can be further synthesized from it, such as ethyl 4-chloroquinazoline-6-carboxylate, 2- n-Propyl-4-methyl-6-carboxybenzimidazole, 4-methyl-2-ethyl-1H-benzimidazole-6-methyl carboxylate, 3Chemicalbook, 4-dihydro-4-quinazoline Homo-6-carboxylic acid, 4-aminophenyl-1,3-dicarboxylic acid, 4-amino-3-methylbenzoic acid methyl ester, 4-nitrophenyl-1,3-dicarboxylic acid, etc.; another 3 -Methyl-4-nitrobenzoic acid is also used in medicine and is an important intermediate in the synthesis of antihypertensive drug telmisartan and AIDS drugs.