1-Hydroxy-7-azabenzotriazole

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"HOAt" redirects here. For hybrid organic acid technology, see antifreeze.

1-Hydroxy-7-azabenzotriazole

Systematic name 3-Hydroxytriazolo[4,5-b]pyridine
Identifiers
CAS number	39968-33-7^N
PubChem	181649
ChemSpider	158005^Y
Jmol-3D images	Image 1
SMILES n1cccc2nnn(O)c12
InChI InChI=1S/C5H4N4O/c10-9-5-4(7-8-9)2-1-3-6-5/h1-3,10H^Y Key: FPIRBHDGWMWJEP-UHFFFAOYSA-N^Y InChI=1/C5H4N4O/c10-9-5-4(7-8-9)2-1-3-6-5/h1-3,10H Key: FPIRBHDGWMWJEP-UHFFFAOYAJ
Properties
Molecular formula	C₅H₄N₄O
Molar mass	136.11 g mol⁻¹
Hazards
EU classification	T
N (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

1-Hydroxy-7-azabenzotriazole, commonly abbreviated HOAt, is a triazole used as a peptide coupling reagent. It suppresses the loss of chirality.

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