ODhbt - 3,4-Dihydro-4-oxo-1,2,3-benzo-triazine-3-yl ester
3,4-Dihydro-4-oxo-1,2,3-benzotriazine-3-yl esters of protected amino acids are highly reactive. Couplings using Fmoc-amino acid Dhbt esters (also called OOBt esters) can be monitored spectrophotometrically.