The 1 - Nand 2 - N tautomers can be distinguished conveniently from whether the ion peaks of [ M - 29 ] + and [M -57]+ are rich or not.

• 根据其MS谱图中[M-29]~+及[M-57]~+峰的强度；可以方便地区分1-N和2-N烷基化产物.