analysis. The three-dimensional structure of5b has been determined by X-ray crystallography. The crystal structure revealed the existence of four independent molecules. All structures form two chains with different arrangements and connect to each other via hydrogen bonds to produce two-dimensional polymeric chains. The cytotoxicity of cyclophosphamide (a standard antitumor compound) and its nine analogues
                                    合成了一系列新的 N-膦酰
脲 5b、6a-7c,并通过 1H、13C、31P NMR、IR 和元素分析对其进行了表征。5b 的三维结构已通过 X 射线晶体学确定。晶体结构揭示了四个独立分子的存在。所有结构形成两条排列不同的链,并通过氢键相互连接以产生二维聚合物链。环
磷酰胺(一种标准抗肿瘤化合物)及其九种类似物的细胞毒性,分子式为 R1C6H4 NHC(O)NHP(O)XCH2C(R2)2 CH2Y(X = Y = NH, R2 = 
CH3, R1 = H (5a),     (5b), 
NO2 (5c), X = O, Y = NH, R2 = H, R1 = H (6a,     (6b),     (6c), and X = Y = O, R2 =    , R1 = H (7a)、    (7b)、    (7c)) 以及苯基
尿素针对三种人类肿瘤
细胞系 K562、
MDA-MB-231