这一组中包括黄酮类化合物，二苯甲酮、一些香豆素、木质素、缩合单宁和芪。
The group includes flavonoids, benzophenones, some coumarins, lignans, condensed tannins, and stilbenes.
结果表明：制浆时，不同煤化程度的煤对应的NSF具有不同的最佳缩合度值，添加木质素磺酸钠可有效地提高添加剂NSF的效能。
The results show that the optimal condensation degree of NSF varied with the coal ranks, and the function of NSF can be effectively improved by combining with lignosulfonate.
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