Wiktionary
azobilirubin
n. A red-violet compound formed by the condensation of diazotized sulfanilic acid with bilirubin in the (w: Van den Bergh reaction).
Wikipedia
Azobilirubin
Azobilirubin is the red-violet compound formed by the condensation of diazotized sulfanilic acid with bilirubin in the van den Bergh reaction.