1-Hydroxy-7-azabenzotriazole (HOAt) is a

triazole A triazole is a heterocyclic compound featuring a five-membered ring of two carbon atoms and three nitrogen atoms with molecular formula C2H3N3. Triazoles exhibit substantial Isomer, isomerism, depending on the positioning of the nitrogen atoms w ...

used as a peptide coupling reagent. It suppresses racemization that can otherwise occur during the reaction. HOAt has a melting point of 213-216 °C.

References

Peptide coupling reagents Triazolopyridines Reagents for biochemistry Hydroxylamines {{heterocyclic-stub