The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Analytical study of phenylbutazone》. Authors are Breugelmans, J. G.; Braun, J..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+]).Product Details of 129-18-0. Through the article, more information about this compound (cas:129-18-0) is conveyed.
A review of tests, standards, and assay procedures for phenylbutazone (I) and its Na salt. Adapted methods are given for the determination of I in binary association with antipyrine, aminopyrine, phenacetin, novalgin, aspirin, atophan, caffeine, medonine, and quaternary mixtures in suppositories containing I, aminopyrine, medonine, codeine phosphate, and neutral fat.
From this literature《Analytical study of phenylbutazone》,we know some information about this compound(129-18-0)Product Details of 129-18-0, but this is not all information, there are many literatures related to this compound(129-18-0).
Reference:
Benzofuran – Wikipedia,
Benzofuran | C8H6O – PubChem