Needle crystals. Melting point 244 ° C (decomposition). Soluble in hot water, insoluble in alcohol. Its free radical S-methylisothiourea [2986-19-8] cannot be isolated; its hydrochloride salt [53114-57-1] has a melting point of 59-60 °C.
S-Methylisothiourea sulfate is an intermediate in organic synthesis. The pharmaceutical industry is used in the production of anticancer drugs 5-fluorouracil, propionamidine hydrazone, hydroxyguanidine sulfate, and antihypertensive drugs guanchlorophen, etc.; in the pesticide industry, it is used in the production of fungicides carbendazim, benright and insecticide pyrifox Wait.
