Hydroxybenzotriazole; 1-Hydroxy-1H-benzotriazole; HOBt; N-Hydroxybenzotriazole; 1-Hydroxybenzotriazole; Benzazimidol; 1-Hydroxy-1,2,3-benzotriazole; 1H-Benzotriazol-1-ol; cas no: 80029-43-2