Bortezomib Hydroxy Impurity (1R, 2S)-Isomer ;(Bortezomib Impurity E)

Bortezomib Hydroxy Impurity (1R, 2S)-Isomer ;(Bortezomib Impurity E)

N-[(2S)-1-{[(1R)-1-Hydroxy-3-methyl butyl]amino}-1-oxo-3-phenylpropan-2-yl]pyrazine-2-carboxamide

Impurity reference standard used for related substances testing of Bortezomib drug substance and drug product per pharmacopoeial limits.