Pybop128625-52-5100 % similar Bop reagent56602-33-668 % similar Pyaop reagent156311-83-068 % similar O-(Benzotriazol-1-yl)-N,N,N',N'-bis(tetramethylene)uronium Hexafluorophosphate105379-24-657 % similar Hydroxybenzotriazole2592-95-234 % similar 1-Methylbenzotriazole13351-73-033 % similar 1-Aminobenzotriazole1614-12-633 % similar 1-Hydroxy-1H-benzotriazole hydrate (1:?)123333-53-932 % similar 1-Hydroxybenzotriazole hydrate80029-43-232 % similar PyBroP132705-51-232 % similar