However, with the deepening of research work, especially the measurement of NMR spectrum, it is found that the above-mentioned substances actually have the basic characteristics of aromatic compounds.
However, with the deepening of research work, especially the determination of the NMR spectrum, it is found that the above substances actually have the basic characteristics of aromatic chemicals.
However, with the development of research work, especially the determination of NMR spectra, it is found that the above substances actually have the basic characteristics of aromatic compounds.<br>