Definition: Compounds containing 1,3-diazole, a five membered aromatic ring containing two nitrogen atoms separated by one of the carbons. Chemically reduced ones include IMIDAZOLINES and IMIDAZOLIDINES. Distinguish from 1,2-diazole (PYRAZOLES).
2-acetyl-4(5)-tetrahydroxybutylimidazole [ 2-ATHBI,2-acetyl-4(5)-(1,2,3,4-tetrahydroxybutyl)imidazole,2-acetyl-4-tetrahydroxybutylimidazole ] contaminant/component of caramel coloring III; produces lymphopenia without toxic effects in rats and mice; prevents spontaneous and cyclophosphamide-induced diabetes in mice