Reference of 121-66-4, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 121-66-4, Name is 5-Nitrothiazol-2-amine, molecular formula is C3H3N3O2S. In a Patent，once mentioned of 121-66-4
Disclosed is a novel process for the preparation of 2-amino-5-nitrothiazole which comprises the steps of (1) halogenating (chlorinating or brominating) a N,N-dialkyl-2-nitro-etheneamine having the formula O2 NCH=CHNR1 R2 to obtain a compound(s) having the structure STR1 (2) reacting (I) with thiourea to obtain a compound having the formula STR2 and (3) treating (II) with water.
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 121-66-4 is helpful to your research., Reference of 121-66-4
Reference：
Thiazole | C3H9491NS – PubChem,
Thiazole | chemical compound | Britannica