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∝—硫辛酸——硫脲加合物是从∝—硫辛酸和硫脲在丁醇溶液中或者微量的甲醇溶液中于40℃密塞瓶中放置4天得到的结晶。加合物是无臭微黃色针状结晶在158℃分解,文的组成通过元素分析紫外吸收光谱和极谱分析测定,确定是由1分子硫辛酸和6.3分子硫脲加合而成;
Alpha-lipoic acid-thiourea adduct is obtained by placing alpha-lipoic acid and thiourea in a butanol solution or a trace amount of methanol solution in a 40 ° C. pegged flask for 4 days. The adduct is an odorless yellowish needle-like crystal that decomposes at 158 ° C. The composition of the article is determined by elemental analysis of ultraviolet absorption spectroscopy and polarographic analysis to confirm that it is composed of one molecule of thioctic acid and 6.3 molecules of thiourea;