Structute of nitrogenheterocyclicring quaternary ammonium salt cationic surfactants was identi fied by mass spectrography, nuclear magnetic resonance spectra, infrared spectra and etc.
用质谱法、核磁共振波谱法、红外光谱法等，确定了未知氮杂环季铵盐型阳离子表面活性剂的结构。
2
Triazine is a type of heterocyclic organic compounds, it is important to ringnitrogen organic chemical raw materials.
是一种三嗪类含氮杂环有机化合物，重要的氮杂环有机化工原料。
3
Purine: Any of a class of heterocyclic compounds with a two-ring structure composed of carbon and nitrogen atoms.