Methylthiouracil CAS 56-04-2, the Chinese alias of 6-methyl-2-thiouracil (6-methyl-2-thiouracil), is an important pharmaceutical intermediate; it not only has Chemicalbook antibacterial activity, but also can be used to treat hyperthyroidism. It inhibits the production of thyroxine by inhibiting the peroxidase system in the thyroid, thereby achieving the effect of treating hyperthyroidism