A nitrogen-containing aromatic compound with fused benzene and pyrazole rings plus a ketone group, used as a dye precursor and in pharmaceutical synthesis.
From benzo- (benzene) + pyrazole (a five-membered nitrogen ring from py- + azo- + -ole) + -one (ketone). Systematized in 20th-century organic chemistry.
This compound is famous as the parent structure of azo dyes—when chemists attach diazo groups to benzopyrazolone, they create brilliant, long-lasting colors that became the foundation of modern synthetic dyes that transformed fashion and industry.
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