2-(3'-(2-((Z)-1-(3,4-dimethylphenyl)-3-methyl-5-oxo-1,5-dihydro-4H-pyrazol-4-ylidene)hydrazineyl)-2'-hydroxy-[1,1'-biphenyl]-3-carboxamido)ethyl 3'-(2-((Z)-1-(3,4-dimethylphenyl)-3-methyl-5-oxo-1,5-dihydro-4H-pyrazol-4-ylidene)hydrazineyl)-2'-hydroxy-[1,1'-biphenyl]-3-carboxylate,Eltrombopag Impurity