中间的碳链可大于等于10，或者乙二醇链也可以

类似如下

2-((10-mercaptodecyl)dimethylammonio)acetate
Chemical Formula: C14H29NO2S
Exact Mass: 275.1919
Molecular Weight: 275.4510
Elemental Analysis: C, 61.05; H, 10.61; N, 5.09; O, 11.62; S, 11.64