弱碱（吡啶，二甲基吡啶或可力丁）的存在将亚磷酸三酯氧化为四配位磷酸三酯。
The presence of a weak base (pyridine, lutidine, or collidine ) oxidizes the phosphite triester into a tetracoordinated phosphate triester.
核磁共振谱通常是根据已知的溶剂残留质子峰进行校正，而不是添加四甲基硅烷。
NMR spectra are often calibrated against the known solvent residual proton peak instead of added tetramethylsilane.
然而，干细胞里四分之一的甲基胞核嘧啶却没有鸟嘌呤随后。
A quarter of the methylated cytosines in stem cells, however, were not followed by guanines.
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