EP3761027A1 - ANALYSIS METHOD OF 3-METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE BULK DRUG, TREATMENT FOR AMYOTROPHIC LATERAL SCLEROSIS, INHIBITION OF PROGRESSION OF AMYOTROPHIC LATERAL SCLEROSIS, AND METHOD OF PRODUCING DRUG CONTAINING 3-METHYL-1-PHENYL-2-PYRAZOLIN-5-ONE BULK DRUG