(S)-2-Amino-N-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-4-methylpentanamide 4-Leucylaminoantipyrine 62989-73-5 L-4-Leucylamino-2,3-dimethyl-5-oxo-1-phenylpyrazoline L-4-Leucylaminoantipyrine Pentanamide, 2-amino-N-(2,3-dihydro-1,5-dimethyl-3-oxo-2-phenyl-1H-pyrazol-4-yl)-4-methyl-, (S)- WK 30 (pharmaceutical) WK-30