Methyl 4-(Methylamino)benzoate is used as a reagent in the synthesis of sulfonamide-containing N-hydroxyindole-2-carboxylates as inhibitors of human lactate dehydrogenase-isoform 5. Also used in the preparation of hyaluronic acid-methotrexate conjugates as antiarthritic and antiinflammatory agents.This compound is suitable for lactate dehydrogenase (LDH) related research.