The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《The composite expectorant Expectin》. Authors are Soltesz, Jeno; Bako, Sandor.The article about the compound:Sodium 4-butyl-3,5-dioxo-1,2-diphenylpyrazolidin-4-idecas:129-18-0,SMILESS:O=C(N(C1=CC=CC=C1)N2C3=CC=CC=C3)[C-](CCCC)C2=O.[Na+]).Category: benzofurans. Through the article, more information about this compound (cas:129-18-0) is conveyed.
The use of raw glycyrrhizin (I) improves the quality of the preparation Expectin (II). II is prepared from extracts of primrose root and thyme herbage by the addition of I. No reduction in the hemolytic index was discovered after 1 1/2 years.
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Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem