Bortezomib

((1R)-3-Methyl-1-(((2S)-3-phenyl-2-((pyrazinylcarbonyl)amino)propanoyl)amino)butyl)boronic acid, Boronic acid, ((1R)-3-methyl-1-(((2S)-1-oxo-3-phenyl-2-((pyrazinylcarbonyl)amino)propyl)amino)butyl) Bortezomib, HSDB 7666, LDP 341, LDP-341, MG 341, MLN-341, N-((1S)-1-Benzyl-2-(((1R)-1-(dihydroxyboranyl)-3-methylbutyl)amino)-2-oxoethyl)pyrazinecarboxamide, NSC 681239, PS 341, PS 341 (pharmaceutical), PS-341, UNII-69G8BD63PP, Velcade, [(1R)-3-methyl-1-[(2S)-3-phenyl-2-(pyrazin-2-ylformamido)propanamido]butyl]boronic acid

Bortezomib is  classified as an: Active Pharmaceutical Ingredient (API) / Pharmaceutical Intermediate
SMILES:   CC(C)C[C,H](NC(=O)[C,H](CC1=CC=CC=C1)NC(=O)C1=CN=CC=N1)B(O)O