Other carbamates include methyl carbamate, butyl carbamate, and phenyl carbamate (m. Carbachol is a choline carbamate and a positively charged quaternary ammonium compound. Clothianidin is an alternative to organophosphate, carbamate, and pyrethroid pesticides. Urease catalyzes the hydrolysis of urea to form ammonia and carbamate. Secondary reaction products include semicarbazide and ethyl carbamate. Polyurethanes neither contain nor are produced from ethyl carbamate. Heating the azide in ethanol yields the ethyl carbamate via the Curtius rearrangement. Soy sauce may contain ethyl carbamate, a Group 2A carcinogen. In addition to ammonium bicarbonate, this material contains ammonium carbamate (NHCONH), and ammonium carbonate ((NH)CO). The so-called carbamate insecticides feature the carbamate ester functional group. Ethyl carbamate (also called urethane) is an organic compound with the formula CHCHOC(O)NH. This term is also used for esters of carbamic acids, such as methyl carbamate HNC(=O)OCH. NH[HNCO] consisting of ammonium and carbamate . The carbamate spontaneously and rapidly hydrolyzes to ammonia and carbonic acid. Other research found that fermented food contains a carcinogenic by-product, ethyl carbamate (urethane).