二缩 meaning in English

biuret test

Synthesis and characterization of carbazole based dithiosemicarbazones
含咔唑环的二缩氨基硫脲的合成与表征
Chiral quaternary ammonium salts were synthesized from cinchonine in cinchona alkaloids using chloromethylated polystyrene - polyethylene glycol , diethylene glycol , triethylene glycol and glycol as polymer - supported phase transfer catalysts , finsl products were characterized by ftir , elemental analysis , scanning electron microscopy , x - ray photoelectron spectroscopy ( xps )
摘要以金鸡纳生物碱中的辛可宁为原料，氯甲基化聚苯乙烯聚乙二醇、一缩二乙二醇、二缩三乙二醇、乙二醇等为载体合成了几种聚合物负载的手性季铵盐，并对它们的结构用红外光谱、元素分析、扫描电镜和x射线光电子能谱等测试手段进行了表徵。