| 摘要 |
The invention provides crystals of N<SUP>2</SUP>-(N,N-dimethyl-L-valyl)-N-[(1S, 2R)-2-methoxy-4-[(2S)-2-[(1R,2R)-1-methoxy-2-methyl-3-oxo-3-[(2-phenylethyl)amino]propyl]-1-pyrrolidinyl]-1-[(S)-1-methylpropyl]-4-oxobutyl]-N-methyl-L-valinamide or salts thereof which possess potent antitumor activity and methods for their preparation. |
