EP1534390B1 - 3'- (2z)- 1-(3,4-Dimethylphenyl)-1,5-Dihydro-3-Methyl-5-Oxo-4h-Pyrazol-4-Ylidene Hydrazino -2'-Hydroxy- 1,1'-Biphenyl -3-Carboxylic Acid Bis-(monoethanolamine)