Ethimazole is a diphenyloxazoline derivative. The appearance of pure ethimazole is white crystal powder, melting point: 101.5 ~ 102.5 ℃; decomposition temperature 293 ℃; vapor pressure (25 ℃): 7.0 × 10-6Pa; n-octanol / water Kow Log P = 5.59 (25 ℃) ; Solubility (g / L, 20 ℃): 7.04 × 10-5 in water, 309.4 in acetone, 104.0 in methanol, and 251.7 in xylene.