Dihydrate of benzothiophene compound or of a salt thereof, and process for producing the same

摘要

An object of the present invention is to provide a compound that can be used as a more superior therapeutic agent for central nervous system diseases. The present invention provides a dihydrate of 7-[4-(4-benzo[b]thiophen-4-y1-piperazin-1-y1)butoxy]-1H-quinolin-2-one or of a salt thereof, and a process for producing the same.