Molecular Structure of 5-Amino-3-methylthio-1,2,4-oxadiazole (CAS NO.55864-39-6):

IUPAC Name: 3-methylsulfanyl-1,2,4-oxadiazol-5-amine
Empirical Formula: C₃H₅N₃OS 
Molecular Weight: 131.1563 
Surface Tension: 76.3 dyne/cm 
Density: 1.43 g/cm³ 
Flash Point: 128.8 °C 
Enthalpy of Vaporization: 52.87 kJ/mol 
Boiling Point: 289.4 °C at 760 mmHg 
Vapour Pressure: 0.00221 mmHg at 25°C 
Index of Refraction: 1.595

Decomposes violently at its mp of 97–99°C. Upon decomposition it emits toxic fumes of SO_x and NO_x.

 5-Amino-3-methylthio-1,2,4-oxadiazole ,with CAS number of 55864-39-6,can be called 3-(methylthio)-1,2,4-oxadiazol-5-amine ; 1,2,4-oxadiazol-5-amine, 3-(methylthio)- .

 5-Amino-3-methylthio-1,2,4-oxadiazole (CAS NO.55864-39-6) is a toxic substance,it has the risk of explosion near the melting point of intense decomposition, burning will produce toxic nitrogen oxide and sulfur oxide fumes,so it should be stored in cool and dry environment,dry powder,foam,sand, carbon dioxide,water mist can be used if something urgent happened.