求溶剂DMI的介电常数,在各种手册上都查不到

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想请问下各位老师有没有用过溶剂DMI的，查不到相关介电常数和折射率数值，分子式为C5H10N2O，又叫1,3-二甲基-2-咪唑啉酮;1,3-二甲基-2-咪唑酮;二甲基乙烯脲;1,3-二甲基咪唑啉酮;N,N'-二甲基亚乙基脲;二甲基咪唑烷酮;1,3-二甲基咪唑烷酮;N,N'-二甲基-2-咪唑啉酮，外文名：1,3-Dimethyl-2-imidazolidinone;DMI;DMEU; N,N-Dimethylethyleneurea; 1,3-Dimethylimidazolidinone; NN-Dimethylethyleneurea; N,N'-Dimethylethyleneurea; 1,3-Dimethyl-2-imidazolidone; N,N'-Dimethyl-2-imidazolidinone; Rhonite 1; Karbomos TsEM; 1,3-dimethyl imidazolinone; 1, 3-Dimethyl-2-imidazolidinone; 1,3-dimethylimidazolidin-2-one;