Bop reagent56602-33-6100 % similar Pybop128625-52-568 % similar O-(Benzotriazol-1-yl)-N,N,N',N'-bis(tetramethylene)uronium Hexafluorophosphate105379-24-650 % similar Pyaop reagent156311-83-045 % similar 1-Methylbenzotriazole13351-73-038 % similar Hydroxybenzotriazole2592-95-236 % similar 1-Aminobenzotriazole1614-12-635 % similar 1-Hydroxy-1H-benzotriazole hydrate (1:?)123333-53-933 % similar 1-Hydroxybenzotriazole hydrate80029-43-233 % similar N,N,N',N'-Tetramethyl-O-(3,4-dihydro-4-oxo-1,2,3-benzotriazin-3-yl)uronium tetrafluoroborate125700-69-832 % similar