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Priority claimed from US00372313Aexternal-prioritypatent/US3856792A/en
Priority claimed from DK513478Aexternal-prioritypatent/DK513478A/en
Application filed by Upjohn CofiledCriticalUpjohn Co
Priority to DK487481ApriorityCriticalpatent/DK487481A/en
Publication of DK487481ApublicationCriticalpatent/DK487481A/en
1- (4-methyl-6-hydroxy-2-pyrimidinyl) -3-methyl-pyrazolin-5-one for use as an intermediate in the preparation of mepirizole and a process for its preparation.